In context, the comments I speak of go along the lines of "Yeah, the Russian leadership might be smart, but the war hawks in the West are crazy enough to just start a nuclear war, to just press the red launch button on a whim!".
I mean, of course, nuclear weapons are a very real thing, but they are categorically not triggered by emotions. I will try to explain why.
I will start by saying that it is possible to psycho-analyse the poster of such comments and produce a fully-fledged report specific to that person, and thus save time explaining complicated phenomena in international relations. In fact, I could end this article right now, since I have already implied that a person projects his or her own internal environment onto the external world (e.g. "I'm a victim, and we're all doomed!"). But instead I feel that it is more worthwhile and less provocative to simply explain the very basics of analysing post-9/11 geopolitics by using an example.
There are two boys of the same height and weight. Neither of them has had any professional training in any martial art or boxing. They are raw, so to speak. They are instructed by a neutral (vetted) referee to fight each other in 5 minutes, but not to kill. So we have 2 boys and 1 referee, who will only intervene if he judges that either boy is close to being killed. Both boys are checked over by the referee before the fight begins, so that neither of them has any bladed weapon or anything that may give an advantage.