Egotist in over his head or not, there's an important place for the likes of him in the important debate on geopolitical issues.
This actually seems like a fairly important assessment that you should not hand-wave away. Surely you should not be listening to egotists in over their heads — by their very nature they have nothing valuable or important to contribute.
This assumes that someone being an egotist with self-pretensions makes anything they might say worthless. I didn't say he was an "Egotist in over his head", I said that whether or not he was would be irrelevant.
I have to disagree entirely with that seeming idea of yours anyway. I think Meclazine hit nail on the head when he said, "It's just good to see another perspective on the situation." You seem to think that he fitting certain negative frames makes him someone with nothing interesting to say - I don't, and I must say, I never will.
Moreover, intellectual curiosity and open debate, thought-provoking things, are very important, particularly in these sorts of fields. I'm glad Mearsheimer speaks his mind on these things, and in that way he advances the entire craft. Reasonable people can disagree on Mearsheimer, but he certainly is not someone 100% wrong on 100% of things, if Red Velvet's post is anything to go by.