I've seen that argument before—if, indeed, you are saying that pedophilia will be treated like just another form of sexuality—but I don't think it holds any water.

The same communities that are most strongly in favour of normalizing all the facets of LGBTQ+ sexualities, gender identities, etc are also, generally speaking, almost fanatically devoted to the idea of consent.

Minors can't consent.

There are certainly groups of people trying to push for the normalization of pedophilia (I've seen various places talk about "Minor Attracted Persons", or "MAP", mostly in the context of PSAs warning young people to beware of them), but they are, at least for the most part, entirely separate from the people trying to make every type of sexual activity imaginable between consenting adults normal and accepted.