That’s just not true for several reasons. First off, your statement is false. There are quite literally millions of people globally who both support gay rights

That’s just not true for several reasons. First off, your statement is false. There are quite literally millions of people globally who both support gay rights and do not think promiscuity is good. You might be confusing “finding promiscuity bad” with “condemning promiscuity”, which are obviously two distinct concepts. Even if they were considered the same, it’s still obviously not true. Second, it’s clear that—generally speaking—developed western societies no longer “regard homosexuality as dangerous to harmonious society”. Otherwise there would obviously not be widespread support for same-sex marriage. That feeling isn’t universal yet, but it’s unlikely to be terribly long until society generally stops worrying about it.