Earlier quoted context omitted.
Are you suggesting that a closeted person has any sort of obligation to come out to (potential) bigots so that said bigots can attain a more enlightened worldview? It is not incumbent on marginalized people to teach their oppressors the errors in their ways, often at great risk to themselves.
Who is it that teaches the oppressors the error of their ways? I'd suggest it is actually the marginalized people. Civil rights movement is a great example.
The only way to get to people like that is to hurt them, either physically, mentally, economically or socially. That's what we're doing as a collective by changing norms so that it's no longer considered acceptable to beat people up for being .
Doing that will result in conflicts. Sometimes those conflicts will escalate into violent ones. As a single person it's often not viable to proceed into that territory alone, and so it's better to widthdraw from that society.