That's kind of the point. Sexuality is more complex than that. I know the conservative mind only understand everything in binary black and white, but most things have more nuance.
Alot of these people who are otherwise straight men go after boys. To a pedophile, it generally doesn't matter if it's a boy or a girl. It matters that they have access, and it's a child. It's a fucked up, demented sexuality. Pedo's are opportunistic predators, they go after what they can get.
It's "gay", sure. But i'm not sure doing one same-sex act makes one "gay" as a whole, especially in the context of pedophilia where the gender is often irrelevant to the pedo.
Alot of pedophiles are gay, sure. Alot of pedophiles are straight, as well. There is no actual evidence that suggests gay people are any more likely to be pedophiles than anyone else. It's just... facts. I get it, we don't like gay people here, but we shouldn't just ignore reality.