We've got one of those in our backyard. The logical stretches necessary to justify these beliefs is impressive, it's basically claiming there's a 400 year active conspiracy theory by people of all walks of life from all corners of the earth using different disciplines.
Who gets to decide what harm is acceptable? We spend our lives harming each other, sometimes we can "justify" it but often we can't. "Justification" isn't objective.
There are all kinds of sexual attractions that humans possess. Some I relate to, some I laugh at, some that I find unpleasant. I don't know that any of us have the right to claim that "ours" is more justified in any of those categories than another person's.
Who gets to decide who gets "rights" and who deserves "protection?"