On that we agree.
BUT not to the extent of starting a nuclear war. I've no doubt that in a conventional war between NATO (with USA) and Russia the Russian military would be shredded in a few short weeks, Problem is THEN does Putin resort to nukes? Yeah I think most of their nukes would misfire and fail. But it only takes a few to make a very bad day.
I don't think he is that insane (or his generals would let him) but the fact he might is an issue that prevents outright ending his regime for the sake of Russians and the rest of the world. So how to handle Putin is a tricky question. The world can hope his successor is saner and Putin has a cardiac arrest sooner.