I would have to find the study, but am pretty sure I remember that aspect right. It makes sense to me, since becoming a worse human being (=more violent) is usually easier than becoming a better one (=less violent).
One thing to take into consideration is that transmen intentionally want to get male socialisation and, indeed, "act male". Which means that they have much more motivation to be aggressive than men who grew up in an environment where solving problems with violence is considered uncivilised.
It is possible that the study didn't make any differences between the severity of crimes (just like these ridiculous domestic violence studies where a woman slapping a man is counted the same as a man breaking a woman's jaw) and aggression towards other (trans)men and sexual violence against women.
But all in all, I can say that I am not particularly keen on sharing facilities with transmen. The internalized misogyny alone would make them unpleasant to be around.
They can have an extra room, is what I am saying. Especially since, with transmen who "pass", it would be difficult to tell them apart from actual men. Who of course would be happy to walk into women's spaces not even having to bother with a dress. (Of course, the likes of Danielle Muscato would like to do so while claiming to be transwomen, so we are now at a point where even self-identification as transman wouldn't be worse than transwacktivist agenda.)