(Having both "pro-russian" and "pro-western" family members, so I'm engaged in lots of discussions currently and would be glad for new information, no matter which side)
I think it's important which countries the experts are coming from. That our own IR/Russia experts are sharing this view doesn't seem very surprising to me - it's a war situation after all. I just notice that a lot of non-Western countries seem to be at least undecided which narrative to follow, e.g. Brazil, India, Turkey, many African countries. (Ignoring China which is obviously allied with Russia and therefore also has a clear bias).
Also, BRICS membership seems to be in demand, what I wouldn't expect if it was generally believed to be dominated by an insane, warmongering megalomaniac.
Mearsheimer is not alone though (even though it's definitely a minority position here). Jeffrey Sax, Ulrike Guerot and, well, Noam Chomsky come to mind, or also organisations such as fair.org with well-documented sources.
I don't think it's important to engage in prejudice based on national origin.
> I just notice that a lot of non-Western countries seem to be at least undecided which narrative to follow
141 countries decided that Russia's aggression is deserving of condemnation and must stop: https://en.wikipedia.org/wiki/United_Nations_General_Assembl...
Additionally, the court with relevant jurisdiction (composed of impartial judges from western and non-western countries) has decided that Putin should be arrested and tried for his crimes: https://www.icc-cpi.int/news/situation-ukraine-icc-judges-is...
Doesn't seem too undecided.
My post did not cover Chomsky's takes on the matter because, honestly, I have not read them. Not for lack of desire, just personal time and priority.
Because personal attacks are common, I am western born and raised and I don't consume any media outside western media outside of the sporadic stuff that drifts down through social media.
The IR community does not share Mearsheimer's take. He is very much known to be the exception. Which is why he's the only one we're referring to by name here, because his analysis is so contrary to the overwhelming consensus of experts.