Cool, you agree. You are one of the more sensible ones, for sure.
Do they spread more disease than heterosexuals? Interesting. So lesbians are going around getting all kinds of people sick? I doubt it. I am assuming your study was more particular. Or, by "gays" do you mean just men? My apologies, I can't keep up with what the kids say these days. Do you think the general populace would agree with you? I am thinking probably not. So, yes, you are golden for presenting reasons that are accessible to the general populace, but I don't think that one would get much traction.
I'm thinking your last point is a slippery slope, which is a fallacy not a principle.