I didn't reach my conclusion overnight. It's happened gradually. But I think I'm going to stand by it now.
Trannies are (by definition) mentally ill and don't even respect their own bodies. In fact they loathe their bodies to the point that they're willing to self-administer poison and subject themselves to genital mutilation. By their very nature, they're all too happy to ignore and even deliberately violate boundaries (physical, mental and social). Being trans automatically means their brain is already wired to firmly believe things are not as they appear, even in the presence of overwhelming evidence or common sense. That's the same kind of thinking that leads to dangerous rationalizations, e.g. a pedophile arguing that his victim "came onto him" or "gave consent."
Building from the premise that ultimately we (as human beings) care about ourselves first and foremost, and then others, it stands to reason that if the average tranny disrespects their own body enough to mutilate and violate it intimately, they won't have any qualms "devaluing" others' bodies as well and violating their boundaries. And who better to target than the weak and vulnerable, like children and teenagers?
Whether they ever act on those thoughts and impulses, I think they always have them in one form or another. They clearly view sexuality in a very different fashion than normal people do, and they're all too happy to ignore social norms and taboos.