Yeah I mean if you assume all countries are maximally aggressive it makes a lot of sense, but there’s a fundamental problem in that the empirical evidence does not sustain this suggestion.
That's an oversimplification. I wouldn't dismiss Mearsheimer so easily. He has applied his theory with great predictive power, particularly in regard to China, for example. You might be interested to read his debate with Zbigniew Brzezinski in 2009 on this matter [1].
[1] https://en.wikipedia.org/wiki/Offensive_realism