> Knowledge alone doesn't necessarily mean causation, but knowledge combined with omnipotence and sovereignty in creation does, in my opinion.
I'm not sure what you mean by this. Are you implying that (1) everything is determined or (2) God causes all evil and suffering or (3) something else. Some explanation would help me.
> you might take an open theist position
I'm not an open theist.
> The problem remains of evil being perpetuated as it occurs however.
Evil is perpetrated mostly by sinful people, and I explained why I believe there is justification for why God doesn't stop most of it.
> I wouldn't allow certain atrocities to continue for months or years, as many acts of evil do.
Again, we must consider the larger argument of the burden of proof on you to show either that (1) it's impossible that certain goods and benefits come from that, (2) it's indicative of a problem in the grand scheme of things because evil is outweighing good in the universe, or (3) all evil is unjustified.
> If he shares in suffering then he will have intuitive knowledge of how bad it is.
Correct. God Himself suffers, feels grief, knows rejection, etc. And, of course, we believe that Jesus experienced intense suffering at the hands of evil in his crucifixion.
> His lack of aloofness in this domain would conflict with his elusiveness elsewhere
I don't perceive a problem between God being separate from creation in his nature and yet choosing to participate in it by experience. I think we can all empathize with a ruler (king, president, prime minister) who knows what it's like to be a normal person and yet has the authority do help as reason allows. (I say "as reason allows" because part of what I was claiming is that it would be unreasonable to God to eliminate many evils.)
> Simply sharing in suffering doesn't cure the problem for many issues around the world.
This is true, and I didn't claim that it did.
> You might argue that a price must be paid for evil, but punishment should be preventative more than retributive, in my opinion.
The whole point of Christianity is that God will enter a human soul and re-create that soul. I would assert that Christ in a person's life is tremendously preventative, both for that individual and his/her actions, but also in the influence that person has on others. I would say that 2 millennia of Christianity has been profoundly preventative in removing evil before it begins.
But then you talk about "retributive." We seem to have jumped suddenly from a conversation about the justification for evil on the Earth to a conversation about punishment in the afterlife. It seems to me an odd logical (or conversational) leap.
I would contend that God, being omniscience and righteous, will treat everyone exactly fairly.