Precedent of not using nukes before (excluding Hiroshima), not wanting to lose nukes against nuclear states, but most importantly, us treating our enemy with a modicum of dignity, just like Allies treated the Germans. If we truly believe that we are freeing Russia from oppressive dictatorship that got them into a war, it shouldn't be a big problem.

I think all the game theory "rationality" is off the table anyways, because the very act of Ukrainian uprising against Russian invasion is already irrational (see ultimatum game). And the act of some other countries acting on Ukraine's behalf is irrational too.

MAD is just a THEORY. Very nice mathematically, but the real world is much more nuanced. And IMHO it's a scarecrow used to justify ownership of nuclear weapons, which are just horrible and should be banned.

Addendum: Hitler actually wanted to destroy Paris (see https://en.wikipedia.org/wiki/Nero_Decree), but it, almost by miracle (in reality it was brave work of different people involved) survived. We need to have a hope, but also get rid of all the nukes.

This is just so naive and unrealistic that I don't understand how anyone could believe it. You can't count on adversaries acting with dignity when they have core interests at stake. In the future more countries will acquire nuclear weapons, or ally with nuclear powers, specifically because of what happened to Ukraine.

I think you can make a better counter-argument than "it's unrealistic, people are stupid and they won't do it". The idea that more nukes are making the world safer is like the idea that everybody having a gun is making USA safer.

There has been some progress on this in recent years, see https://www.icanw.org/. And in fact the nuclear arsenals of USA and Russia have been (albeit too slowly) reducing over the past 30 years. But more governments (NATO expansion) relying on nukes for their security (which is a false sense) is a pretty big setback.

It's not a matter of stupidity at all, it's purely self interest. Giving up nukes is irrational when they're such an effective tool.

The USA and Russia reduced their arsenals primarily as a cost savings measure. Keeping the weapons systems operating is shockingly expensive. Modern delivery systems are more accurate so we can now ensure MAD with fewer warheads.

I think I already addressed "rational self-interest" (and how it can lead to stupidity) elsewhere in the thread. It's not an end-all be-all of human nature.