People also need to not support rapists. I mean, give him.support as a friend while clearly letting him know he was wrong. But, to try to ask for leniency minimizes the rapist actions, ignoring the victims.
Was he though? I don't know anything about him, nor do I have strong feelings about his letter because I know there's a chance he was threatened by the most dangerous and litigious cult on the planet to write it.
I'm sure if he's truly good and charitable as you say, that he will be free to continue those habits without bringing unnecessary controversy to an anti-sex abuse organization of all things. His letter directly opposes what such an organization stands for.
I think it's quite clear if this passes the BS test or not by simply asking what do you think his organization that he's the front man in the eye had been approached by the 2 women(possibly more) Masterson raped to help them? Do you think he would of helped them prosecute Masterson based on his letter?
A charitable man. Good man is in question. People are complex. Nobody is all good or all bad. That's children's stories. He likely say the good in his friend. But his friend did evil things that hurt multiple people.