I have a feeling that this kind of violent direct action is part of a performance of being 'the most marginalised'.
Historically, marginalised and oppressed people eventually can't take it any more and aggressive or even violent protest breaks out. This often happens after years of non-violent, peaceful demonstrations for civil rights are ignored, or are violently suppressed, and the angrier voices within the community win out by saying, look, if we protest peacefully they just baton charge or even shoot us dead, we have to meet force with force.
The incongruity about Bash Back and TRA violence is that they haven't had to put in the hard yards of fighting discrimination and marching for basic civil rights - trans people have the same civil rights as anyone else, and have in fact achieved a totally disproportionate amount of power and influence in society.
So they have gone straight to the violent stage of protest, without the years of political activism, non-violent civil rights marches etc. that truly marginalised groups usually go through.
It's performative, self-indulgent, and insulting to the groups who do have to work hard for their civil rights.