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Probably falls under Beauty Equals Goodness or Red Right Hand.
It's not just pedophiles, anyone intended to come across as a pervert is usually unattractive to play up the "creepy" angle.
Stories don't tell us monsters exist; we knew that already. They show us that monsters can be trademarked and milked for years.
Some works do depict date rapists and such as physically attractive to play up the Beautiful Elite / White Hair, Black Heart / Face of an Angel, Mind of a Demon thing
They often wear Child Molester Glasses
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Evil Is Ugly could be its own thing. I thought at one point it was folded into Evil Makes You Ugly, but it doesn't seem like it now.
^ if it's just a corollary to Beauty Equals Goodness, then we have it covered
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
Didn't see that before. Yeah, thirding Beauty Equals Goodness, then.
Yet, Beauty Equals Goodness is so vast, that this idea of the Ugly Pervert should merit its own trope as a subtrope of Beauty = Goodness, right?
^ thing is, not all perverts are ugly.
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
No, and not all good people are beautiful. That's why it's a trope and not people sitting on chairs.
Maybe expand that Child Molester Glasses that eroock mentioned into a general "stereotypical pedophile" trope, including the glasses, the ugliness, sometimes a mustache and generally outdated fashion choices? It does seem tropable, but probably doesn't need to be quite so specific.
The standard of fiction of depicting child molesters as physicaly unattractive, grimy or at best "homely", whereas there's no actual standard appearance in real life for sexual perdators