It seems likely to me that two pedophiles who aren't interested in adults would pretend to be gay to be able to adopt children. That doesn't necessarily mean actual gay people are dangerous to kids. For Lesbians it seems like it is debated whether they really experience more violence from other lesbians. According to one study Lesbians seem to generally have experienced more domestic violence in their lifetime but one third of that is received from male partners (they often live in heterosexual relationships before coming out) which means they experience slightly less violence with female partners than heterosexual women with male partners. https://en.m.wikipedia.org/wiki/Domestic_violence_in_same-sex_relationships