I would tend to say that it's likely that in average, a trans woman is probably more aggressive than a genetic woman.
-They have probably received a male education (both from parents and conditioning from peers) impossible to entirely get rid of, which promotes more aggressivity than a female one, in general.
-They probably went through a lot, which is a factor promoting aggressivity.
-They have been exposed to testosterone for a long while, which creates aggressivity. It could very well have long-term effects on character, even after starting HRT.
-They have probably been forced to adopt "aggressive" (assertive?) comportments in order to either be allowed transition by professionals or be accepted by peers or family.
-They could have developed a reflex of aggressivity to keep people away, since relationships as male hurt them.
-They might have overcompensated their dysphoria, whilst in denial by adopting very masculine behaviours, including aggressivity, and kept the habit.
-They might feel they have a "trans identity" and pride to protect and bare teeth whenever it is menaced; in a similar fashion that some Blacks with a sad history could almost look for racist comments and jump the gun with every harmless comment that mentions Blacks.
-They might, in the contrary, want to absolutely not be trans, and react violently as soon as they feel they are not treated exactly like other females.
-They might have embraced a fiercely feminist attitude, which pushes women to "fight for their rights", so they tend to fight a whole lot, in a way that can remind of some feminists of the 70's (or 60's?) who went very extreme by accusing every man of willingly imprisoning them, burning the "evil symbol of submission" that was the bra, etc. In short, the attitude that many people have in front of adversity: they have been having crap, and when it goes too far, they either want the weight of that crap in gold, or ten times the amount of crap on who they (rightfully or not) blame for their hardships.
There are plenty of factors, many of which I probably haven't thought of, that makes our group prone to aggressive comportments.
Despite all that, I don't think that fundamentally, a transsexual tends to be more aggressive. The "illness" just happens to be likely to come with a package of related "risk factors".
Miki: What?