Humanization does not equal leniency.  I don't care about <Person>, they're a horror of a person.  It is no defense of <Person> to insist on respect for other people.

I care about other trans people, who may see that their validity as a person can be revoked through no fault of their own.  “This one is a horrifying rapist, so we take back everything we said about trans men being men and trans women being women.”