I'm old enough to remember PIE. An astonishing number of prominent people, including politicians, got sucked in by the rhetoric.
Paedophiles never gave up. They've been working their way into any setting which offers opportunities to access children ever since.
Queer theory, child transition, and the move to celebrating fetish at Pride and in LGBT organisations generally have created a slew of potential opportunities. Actually having a photo of the man with a hard on watching kids playing in the pup play tent is a rare but illustrative example.
Kids with gender identity issues are targeted all the time online by older people who claim to be transgender. Some of them may be transgender but it doesn't make much difference. Inviting underage kids to contact you to discuss their issues with gender is totally inappropriate in any circumstance. I remember a Reddit thread discussing an individual who was offering to obtain hormones for kids and inviting them to go this person's house so they could inject them. Whether this individual was actually trans made no difference. The behaviour was egregious. Inexcusable.
Any vehement rejection of the idea that safeguarding should be a priority in the LGBT community is in itself a giant red flag.