It highlights an extra layer of stupid.

There’s this delusion amongst transphobes that they can “always clock a tranny” and that they’re never wrong when they decide that someone is secretly trans because they have a more prominent Adam’s apple or something equally stupid. Of course the truth is that they’re wrong constantly and are just idiot bigots, which this illustrates rather poignantly unfortunately. They don’t really know who is or isn’t trans, they just want to pretend they know so they can feel vindicated by “recognizing” trans people, and they convince themselves that trans people can never truly blend in to society. Because if trans people really were capable of being indistinguishable from cis people, then that would mean that at some point they might have, gasp, treated a trans person like a human being and used the proper pronouns. The horror.

Of course trans people shouldn’t have to blend in, they shouldn’t have to pass to be treated as the gender they identify as, or with basic human decency.

It shows how someone’s irrational hatred of a specific group can also harm people not part of that group.

It shows people that it’s not just trans people at risk due to this violent rhetoric the right spews. Everyone is at risk of being targeted even if they are perceived as trans.

I’m a cis man, but I don’t have the deepest voice, and I’ve been worried about this kind of thing happening for a while since I live in the south, and it looks like I was right to worry.

All the other responses have been good but I think it helps to show to slightly more “moderate” transphobia who wouldn’t kill transfolks themselves but don’t think anti-trans rhetoric is that bad by showing that they themselves are also in danger.

It promotes the culture war which serves to divide us so we fight with each other instead of addressing the real issue: extreme inequality.