Wait a minute... suffering is because of the weakness of our sinning?
It can be.
I mean, that while we are giving in to weakness so we sin, this weakness also is keeping us available to deep suffering which we would not be going through if we were staying in the strength and safety of God's love. So, it is good to see how we can help to bring suffering on our own selves, so that we seek our Heavenly Father to correct (Hebrews 12:4-11) and heal (James 5:16) us of this.
But you are right to think that it is wrong for me to just look down on and criticize people whose own selfish stuff helps to keep their deep suffering going on and on; because Jesus cares about people who are suffering because of their sin problems and selfishness > Matthew 11:28-30 > and Jesus desires that we also have hope and compassion for ones in sin trouble >
"He can have compassion on those who are ignorant and going astray, since he himself is also subject to weakness." (Hebrews 5:2)
To me, Fire Dragon, this scripture means that I can use my own sin's suffering to help me understand and feel for others who are in sin trouble.
As an illustration of how someone can help to cause oneself to suffer > let's say someone shoots and wounds me. Yes, the pain of being shot is the fault of the person who shoots me. But if I then choose not to treat my wound and this causes me to get an infection so I keep on suffering after I could have been healed, whose fault is this?
Also, we have 1 John 4:18 >
"There is no fear in love; but perfect love casts out fear, because fear involves torment. But he who fears has not been made perfect in love." (1 John 4:18)
This means how God's love with almighty power can easily cast out fear. But if someone is doing things in selfish love (Matthew 5:46), they do not have God's almighty power to protect them from fear. And I understand that there are personality torments which have their roots in fear and worry.
So, in the weakness of selfish loving, any of us can get infected with fear and then, also, keep on suffering in personality torments which are connected with fear. Selfish loving has me in weakness so I can be under the power of how evil is meant to effect me.
We can, instead, be in the power of God's peace to protect our minds and hearts from fear and worry and their various sorts of torment > Philippians 4:6-7.
So, God is the One who is able to keep us from getting infected with fear and worry and their personality torments.
Another example > if someone does something bad to you and you let yourself get infected with unforgiveness, you can keep on deeply suffering for as long as you keep on being unforgiving. What the person did was wrong, but you can decide if and how long the person has power over you to decide how you are and what you do.
"Do not be overcome by evil, but overcome evil with good." (Romans 12:21)
So, part of the problem of evil is how we humans can be selfish and the weakness of our selfish nature makes us weak so we suffer much more, about evil, than we would in Jesus Christ's grace >
You might consider what Paul shares in 2 Corinthians 12:7-15.