Why is there no action on the Israeli nuclear arms?

I don't think the international community has any real power at all, and any power they do have they would only use for personal interest. Israel is too important to a lot of countries economies for them to sanction it, and Israel knows precisely where the line between international laws they can ignore and spit on and get away with, and the international laws they should probably play along with are. Israel might be responsible for all the tings you've listed, but the rest of the international community are partly to blame also for letting them get away with it.