However much I would be inclined to participate in such a pool. It is inherently in poor taste. He might be a scumbag money launderer but I don’t wish him dead...yet.
Has he been tested for polonium 210 or other poisons?
You don’t have to wish him dead - he’s not going to be allowed to live, so all the wishing in the world won’t matter anyway.
Might as well place your bet - you aren’t pulling the trigger, just putting your faith in the consistency of evil.