I personally agree to both sides of thought: The general idea that HRT has shifted enjoyments from violence, and then Asfds's opinion that it's personality-oriented. The male body seems more oriented towards combat-capability, (muscular development, larger size) so I personally think that to an end men are more "Yay!" about making big noises and excessive violence just over being men. Given that testosterone is associated with male development, I feel convinced that the brain's designed to work with it too to help motivate itself to such ends. ---However, men and women are both quite simply human, so all the 'manly' instincts and 'womanly' instincts are inherit in any guy/girl, the ends are just varied to be 'appropriate'...and on top of it someone is always who they are before they're male or female.
So all-in-all, I think the idea that changing the chemicals in your brain will play with your drive a little bit on its own, but at the same time a more severe level probably comes from re-evaluating how one acts to realign with their active identity of physical sex.
For me, personally, I haven't noticed any change, but I'm really early into my transition and in the first place I already get turned away by realistic gore and loud noises. XD