The Department of Justice gets involved in cases not just based on law but also on politics due to limited resources. They literally have to pick and choose what lawsuits they're going to get involved in, or not. The president nominates, senate confirms, the various federal attorneys general who likewise make those kinds of decisions at the local level.
Even if I set aside the incorrect assertion that Trump can't do anything against transgendered persons, self-evidently he can look the other way, as can DOJ, and federal prosecutors. And now that means people are left to defend themselves, or not. Is that justice?
https://transequality.org/1557-FAQ
https://www.washingtonpost.com/local/public-safety/trump-adm...
The Fair Housing Act is supposed to prevent racial discrimation in lending. Does it still happen? Yes. In fact it's widespread and it's institutionalized. It's baked into the system, and the free market, being amoral, games the system to the benefit of those who are already privileged and can pay for that privilege. This is maybe a surprise if you don't know about these things.
https://www.apnews.com/ae4b40a720b74ad8a9b0bfe65f7a9c29
I think people have no idea how fragile the system is, in particular when the head of state impugns, without evidence, and denigrates the federal agencies we depend on to carry out the imperfect justice system that we have. Papering over reality with ideas the legal system will be the superman to save us from the malignancy in the White House is somewhere in between wishful thinking and ignorant.