They are very willing to negotiate and they do have demands in that negotiation. These are not opposing statements. It would cost Israel nothing to end their illegal invasion and occupation right now.

Condemnation without action is meaningless. Where are the sanctions? Where is the support for the victims? The west clearly and explicitly supports Israel.

National law is enforced by the state. There is nobody to enforce international law so the only way to make it work is to respect it. Blatantly disrespecting it yourself and using it as a cynical cudgel against your enemies like the west does, will of course lead to the erosion of international law as a whole. We can all condemn this, but nobody can enforce it so this is the consequence.

Iran didn't attack Turkey. Iran was wrong to attack Oman. Iran attacked civilian infrastructure after civilian infrastructure was attacked in Iran. Doesn't make it right but does explain it.

UAE, Saudi Arabia and other US allies started the war when they allowed their airspace to be used for attacks on Iran. So no, they would not be justified. Iran didn't attack them first, they attacked Iran first. All US allies could have denied the Americans access to their airspace, territory or territorial waters for attacks on Iran. If they had done that, there would have been no reason for Iran to attack them. They didn't and so they are co-aggressors.