Why did you omit the latter phrase of my post?
“…and why the amount of suffering from those causes is apparently not proportional to how evil the victims are.”
Perhaps it was because I was not clear in that statement? If so, I’ll explain: many charitable, honest people get cancer, while many notoriously evil people get away with their crimes. Why is this?
If you are looking for an exact answer to “why them?”, no one can give you that. The will of God is ultimately mysterious and your question will be answered only at the final judgment.
But there still are general answers to the problem of evil from Christianity that still sheds light on the matter, however incomplete.
The first is that suffering and death entered the world because of original sin. Because of it, it became the default condition of ALL human beings, innocent or otherwise, owing to the nature we inherited from Adam and Eve.
The second is that even after the redemption earned for us by Christ, God still uses our default condition of suffering to be conformed to the image of Jesus.
Romans 8:29 “For those God foreknew he also predestined to be conformed to the image of his Son, that he might be the firstborn among many brothers and sisters.”
Romans 8:17 “Now if we are children, then we are heirs–heirs of God and co-heirs with Christ, if indeed we share in his sufferings in order that we may also share in his glory.”
In other words, God only allows evil so that a greater good would come from it. He is not the moral cause of these evils - they are the result of original sin (and later on, the personal sins of all people). The sin of the guilty affects not only the individual, but also naturally have effects vs. innocent people. Even so, from these evil effects, God brings forth an even greater good - the glorification of his children, in the same way he glorified Christ in his obedient suffering.
We may not know who exactly is the cause of the suffering we are dealing with, but as Christians, we know that this evil is only temporary and that God will use it for a greater purpose, in the same way the he used the sacrifice of Christ to redeem the whole world. For we know:
Romans 8:28 "… that in all things God works for the good of those who love him, who have been called according to his purpose.
PS. As for people who commit crimes, if they haven’t paid for their sins in this life, they will still have to pay for them either in purgatory or in hell.