Killing is an act of power, a way of re-asserting domination, even a way of saying, “I am the one who decides who lives and dies.” So killing establishes the killer as sovereign in the moment that he kills, and that is the most toxic form that masculinity can take. Trans women have relinquished masculinity, showing that it can be relinquished, and that is very threatening to a man who wants to see his power as an intrinsic feature of who he is.