Why are they in Jail----
A few answers I know for sure:
Doing drugs
Drunk driving
Public Intoxication (in jail in lieu of a locked hospital ward
Selling drugs
Soliciting prostitution
Soliciting sex with a minor
Assault & Battery
Petty theft
Grand theft by about 10 ways=health care fraud, welfare fraud, armed robbbery, credit card fraud, identity theft and 5 more when I can think about them.
Failure to obey police/fire department orders
Failure to obey court orders
Arson
Spousal abuse
Elder abuse
I'll stop here because I can't find my udated California Penal Code in order to keep going. The percentage of TG folks who commit crimes are about the same percentage as that of straight cis-gendered people and along the same ethnic lines.
A jail of any type, level or jusridiction is NOT a nice place to be for anybody if they are loosed in the general prison population. As I mentioned in another thread on this board, rape is about power for people who are so bereft of human heart and spirit that they will always be a danger to others. (I made that statement to an attorney who was questioning me in regard to jury service. His client [white cis-sexual male] turned a bright green when I said that. It was a way to get out of jury duty, although that had not been my goal in saying it.) GLBT's give them an "excuse" for added attention in their own minds, but if the GLBT's were not there, it would be someone who committed another type of crime such as rape of an inmates girlfriend, boyfriend or kid. Substitutes will be found if the source of GLBT's dries up. The fact that others perceive us as being more ready to to consent to bodily assault, and to have higher acceptance of physical abuse, and therefor fail to see that we can suffer at the same level they do, is a crime not on the books. I wish we could force a law like that on to them, but I am trans and not sadistic to non-trans.