It seems that you are assuming Christian theology is true, and then using that assumption to explain why the Jewish authorities were wrong to be concerned that Jesus was serving the devil.
Here's the thing.. If they had evidence He was serving satan they would have his killed ASAP. (look at how he did died, they got him on a trumped p charge of claiming to be the messiah which is a far lessor crime than working for the devil) and they had him crucified.
also look at all the times they where ready to stone him and he backed them down or vanished from the scene. The beginning of the chapter was one such event where Jesus healed a life long twisted cripple man and straightened him out on a sabbath and they plotted to kill him! They plotted to kill him because he healed a man by claiming to do so with the power of God on the 'wrong' day.. and you say look at it from their perspective.
What i see is a impotent religious establishment being userpt by not only good deeds but by things that will over turn the corruption ingrained into a system that demands a man's death for doing good deeds in the name of God and bringing people to the faith.
This is the only instance where he is accused of working for the devil.. Meaning what they saw was so fantastic so unexplainable so beyond the anything they ever experienced They were forced to acknowledge most everything they knew of God was wrong and everything they had been doing was wrong... Or make the claim out of desperation he worked for the other guy. The evidence was so strong here nothing else could explain what they all could not deny what happened!!
What Jesus did was God level stuff and to them (god or their god had never done such a thing) so to them it had to come from the devil. Again they wrongly assumed they where the good guys.
Look what Jesus said that proves He was working for God..
27 You say that I use the power of Satan to force out demons. If that is true, then what power do your people use when they force out demons? (this is rhetorical as they could not force any of these demons out. these people where sometimes stricken from birth with their afflictions for the sole purpose that everyone in the city knew these people where not plants or faking it.
Here Jesus is brought a man undoubtedly that has gone before the jewish leadership many many times and they could do nothing. But here with a word Christ Envokes the power of God. Something in their bibles only men of the highest regaurd could do. Men like the father's of their faith.. expelled the demons and sets the man right by a word.
Again God level stuff as they knew there was nothing they could do anything like that. as God did not back them like he was backing Christ..
So your own people will prove that you are wrong.
So here Jesus is saying if I and drawing out demons in the name of satan by what impotent deity are you calling on who can't get the job done? IE the fact that they call on God and cant cast out these demons shows they are not on the side of God. Rather;
28 But I use the power of God’s Spirit to force out demons, and this shows that God’s kingdom has come to you. Then he says infact I am using the power of God I give god the glory and it is by his name these demons are expelled. the fact I use God's name... is proof God is working with me. and not you. I hold the power and authority you pretend to be, and God supports me and the evidence of this is by my word men are set free from demons and ailments that some had had for life!
The way everyone can know God does not support you is no matter what you do or say you can not do any of the things I have done.
Then the eye witnesses that began to believe Jesus was the promised messiah is what prompted the need to say he works with satan as the leadership was endanger of loosing control to Christ.
Put yourself in their shoes. They didn't believe or even know about Christian theology. You can't blame them for being concerned about Jesus.
Because Jesus did not come in under the banner of Christian theology. Jesus came waving the flags of the messiah. Everything Jesus did checked a box in the prophesy of the coming king. They knew this and it is ultimately why after several tries got a death order authorized by the overseeing roman government. They knew what Jesus was supposed to be and despite witnessing everything he did with God's power they did not want to loose out on what they had, so they killed Jesus with the title 'king of the jews' above his head. if they did not know who jesus was they could not have mocked him this way. plus they would not have known to put roman guards at his tomb to guard it.
EDIT: Instead of assuming Christian theology is true, you should assume some form of Jewish theology common among Pharisees and Sadducees of that time.
Well point 1..
You didn't look at the OP you quoted the bible to set up a red herring and when it was explained now you want to move the goal posts to try and bring out a pov that only exists in speculation..
Otherwise:
examples? what surviving texts are you referring? You do know in or around 70 AD there was one last insurrection and Rome sent an army to destroy everything to burn all of the buildings and libraries to kill all the jewish leadership (sadducees) and loot anything of value?
The point Jesus is making you do not seem to get is why would God allow Satan to do something that would destroy the church before it got underway? Like wise why would satan do something that God wanted done intentionally?
Why would satan pretend to be God to do a good work just to make it possible for Christianity to get started after Jesus leaves, which destroys the old religious paradigm that allows him to infiltrate and control the religious? What would satan help create a system that eliminates religious structure and put the believe and God together directly with out priest or prophet? (no middle man to corrupt)
Then why would God allow satan (even dressed up as acting leader of the jewish religion) perform miracles that would bring conflict to Christ trying to change the religious paradigm?
Answer: neither happened. God gave Jesus the power to cast out demons as Jesus claimed the power to do so came from God.
Like wise when the jewish leadership (who according to Christ was not of God but ruled by satan) could not do any of the things Christ did. (Satan could not cast out his own demons even if he wanted too as he is not all powerful) which is why Jesus could do so with a word from God and all of the jewish leaders where unable to help these life long afflicted people.
Which is why the poeple saw him as the messiah (and so did the leadership) which was for the reason of the desperate attack on Jesus character.
Do you get what I am saying here?