High T has not been proven to be higher aggression. Conversely, frustrated men are more likely to be aggressive, and frustrated men tend to have lower levels.
Has it not? it seems like there's pretty clear consensus that they are positively correlated.
Proof that T causes high aggression in isolation, in humans, thus far, has not been decisive. There is no consensus on this. Looking at the absence of the inverse (low T decreases aggression) would tip a few things.