Let the gays and lesbians die
So there is this pastor who proposes concentration camps for gay people. One of his bright followers considers that this would remove the problem of gay people because they can't reproduce and so they would die out. The stupid is strong in these people.
I'm neither surprised nor shocked. It may be politically useful to act shocked, but I'm not. The reason I'm not is that it's a both a small and big world. It's a small world because news travels fast, and yet it's a big world full of billions of people. Pick any extreme view and you will find a considerable number of people who support it. That's what you get in a world this size. The trouble is that there are gay people who have such extremists as members of their local community. I find it hard to imagine how scared they must be.
The way to deal with such people is to expose them. Let them see what the reaction is to their views. I have seen suggestions that we should ask for apologies for what they say, but that achieves nothing. Apologising doesn't change opinions.
I suspect the only answer is time. Such views will die out along with the people who express them.