[McGruff]

I would have supported Israel using a tactical nuke to destroy that Iranian mountain.

[Harmless Teddy Bear]

There is an area on the border between India and China where China keeps "accidentally" sending their army across and killing Indian solders.

The Indians drive them off with iron bars, rocks and other such improvised melee weapons because the understanding is that as long as no one is shooting it is not a "war". If ever someone starts shooting it becomes a war, not just an "incident" and the rules change drastically.

It is the same with Nukes. As long as no one is using them all the other people keep theirs tucked away as well.

What will happen if someone uses a nuke? No one knows. Maybe nothing. Or maybe once the genie is out everyone will start resorting to them. No one wants to find out.