Trans people are vulnerable, that's it. You did nothing to deserve it.
When I was a kid I remember being at the zoo during feeding time for gorillas. The zoo keeper was chucking sweet potatoes and other things into the pit. Two gorillas were sitting next to each other, a big one and a small one. The big one got hit on the head with a sweet potato and immediately responded with violence onto the smaller gorilla next to him.
Gorillas are smart, there's no way he thought that the small gorilla was responsible for the yam to the head. But he couldn't attack the one throwing potatoes. That other gorilla was vulnerable and accessible. That's all. I think about that a lot.
Also, same gorilla enclosure where Harambe would be killed years later. It's like "come to Cincinnati, see our pit of cruel metaphor!"