Almost all of the evidence I've seen has shown they're wrong. A quick google for statistics on incidences of abuse vs. heterosexual relationships showed they were wrong, and the few sources I've seen (which I couldn't find through my quick google) that showed the opposite where from biased organizations already predisposed against homosexuality.
I could be convinced of the opposite, but that one sentence you gave will hardly bump my prior.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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