Reduced inhibition does not support the thesis of increased agression, unless you define aggression to refer to "aggression shown".

But I'd overall turn the 'cultural' aspect a little further even. I think I have observed a couple of times people to consume alcohol in order to be able to transgress cultural norms because the cultural norms themselves are 'parametrised' for the sober-drunk states.

I.e. get into a fight sober? Could be unacceptable even to someone who wants to get into a fight. After 4 beers? May be perfectly fine for your peer group. Same goes to other things, like dancing, approaching strangers, etc.

What I really found interesting for example is, in my abroad term in Canada. The sober Canadian society was overall friendly and polite, definitely friendlier than in my German home. People held up doors for me (a 20 something man, felt really weird and unexpected), you got compliments for what you wore (never happened to me in Germany), etc. pp. But this radically changed in the 'drunken space' where people were a lot more aggressive and fights were much more the norm.