Before I address that, let me first respond to your claim that those spirit creatures who rebelled against God were irrational demons. That isn't true. The ones who decided to rebel were holy angels who had seen God face to face and who had all their mental faculties intact and not insane irrational demons.
Notice that these spirit creatures had personally witnessed far greater miracles than the Israelites had beheld. They had seen the creation of the Earth and perhaps of the entire universe itself. The book of Job tells us that they celebrated when God finished what is described in Genesis.
Job 38: 7
When the morning stars sang together, and all the sons of God shouted for joy?
So if indeed beholding miracles prevents unfaithfulness then they are an excellent example of just the opposite. They placed their desire above what they knew was right.
We also have Judas Iscariot beholding all the miracles, including the curing of lame and lepers and the resurrection of the dead, performed by Jesus and it didn’t faze him one bit from setting up money as an idol.
John 12:
5"Why was this perfume not sold for three hundred denarii and given to poor people?"
6Now he said this, not because he was concerned about the poor, but because he was a thief, and as he had the money box, he used to pilfer what was put into it.
We have David who believed in God and yet took another man’s wife and murdered her husband. Why? Because he set up lust as an idol.
David Murders Uriah
2 Samuel NIV
11 In the spring, at the time when kings go off to war, David sent Joab out with the king’s men and the whole Israelite army. They destroyed the Ammonites and besieged Rabbah. But David remained in Jerusalem.
2 One evening David got up from his bed and walked around on the roof of the palace. From the roof he saw a woman bathing. The woman was very beautiful, 3 and David sent someone to find out about her. The man said, “She is Bathsheba, the daughter of Eliam and the wife of Uriah the Hittite.” 4 Then David sent messengers to get her. She came to him, and he slept with her. (Now she was purifying herself from her monthly uncleanness.) Then she went back home. 5 The woman conceived and sent word to David, saying, “I am pregnant.”....
14 In the morning David wrote a letter to Joab and sent it with Uriah. 15 In it he wrote, “Put Uriah out in front where the fighting is fiercest. Then withdraw from him so he will be struck down and die.”
Solomon was a rational human being and yet sinned against God by building places of idolatrous false worship for his concubines because it represented a means to a strongly-desired end.
1 Kings 11:7
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N I V
On a hill east of Jerusalem, Solomon built a high place for Chemosh the detestable god of Moab, and for Molek the detestable god of the Ammonites.
Then you have modern-day atheists who see the miracle of life all around, DNA, Nano molecular machines in our cells, the Fibonacci Sequence and because they want to do what they want ignore it and set up the idols of abiogenesis and evolution. I see absolutely no difference between the twain.
There are other kinds of temptations.
The temptation to be free to do as one pleases.
Such a temptation can lead persons to do what they know is wrong in order to attain it.
The Bible tells us that Adam was NOT deceived but sinned anyway. Obviously he was being tempted by SOMETHING despite his knowledge that he had been created and owed the creator respect and appreciation. In effect, despite all that they had beheld they still opted to place the word of what seemed to be a lower animal above God’s. Had it been a bull it would have made no difference. It just represented a means to an end and they took it.
James 1: 14
But each one is tempted when he is carried away and enticed by his own lust.
15Then when lust has conceived, it gives birth to sin; and when sin is accomplished, it brings forth death.…
The same holds true for the Israelites.
BTW
About the Roman guards not describing what they had beheld? That could be explained by the fear they must have felt at being identified as followers of Jesus. The Apostle Peter had experienced that fear and had denied Jesus even though he had witnessed all the miracles. So why expect more from Roman guards who had NOTHING to gain from reporting such an event except ridicule and disciplinary retribution?
Luke 22:54-60(ESV)
Peter Denies Jesus
54 Then they seized him and led him away, bringing him into the high priest's house, and Peter was following at a distance. 55 And when they had kindled a fire in the middle of the courtyard and sat down together, Peter sat down among them. 56 Then a servant girl, seeing him as he sat in the light and looking closely at him, said, “This man also was with him.” 57 But he denied it, saying, “Woman, I do not know him.” 58 And a little later someone else saw him and said, “You also are one of them.” But Peter said, “Man, I am not.” 59 And after an interval of about an hour still another insisted, saying, “Certainly this man also was with him, for he too is a Galilean.” 60 But Peter said, “Man, I do not know what you are talking about.”