btw, Gays and Lesbians have been a part of society forever...now even 71% (and rising) of the country has no problem with them marrying each other...that's not a 'Slippery Slope' downward, it's an acknowledgement that those fellow citizens are productive members of our society (e.g. the CEO of the world's largest company, Tim Cook, is gay), and no threat to anyone...any more than heterosexuals.
If you feel the urge to persecute some group with just cause, focus on those who have no hesitation participating in a coup to overthrow our democracy.