“Both homosexuality and pedophilia are SINS, period!”
That’s been established. The condition whereupon a man gazes upon a child with lust isn’t something that happens naturally. There are a great many homosexuals that want very much not to be, for example.
There is a causation for that type of reaction. For the spiritual, partial possession may be the cause.
For the secular, the fact that they are ‘sins’ has no relevance. The fact that they cost society money, breach the peace, and pose public health risks are relevant enough to investigate scientifically. That they do not is purely political.
You’re right that those in the secular world do not give a rip that the “cause” is sin, grown from the heart. It’s too bad for them.