Not only do the more violent incarcerated people rape incarcerated trans people, the fucking prison guards actually "give them over" to said violent prisoners, by knowingly assigning them to a cell together to placate the violent one.
Happens to cis men as well, if you are perceived as effeminate or known to be gay. Donny the Punk (Stephen Donaldson) was a prison reform activist who brought a lot of attention to sexual assault in male prisons.
His Wikipedia page is a tough read, but he is basically one of the first people to organize around this and bring the issue to American consciousness.
Defund the police was a watered down psyop. Abolish prisons and police.