Not a theory. Fact. I knew this guy, friend of my ex-wife (figures) who was a homo who had AIDS. He was spreading it as far and as wide as he could. No, he wasn't telling anybody, it was on purpose. When I heard he kicked the bucket, the ex was surprised when I told her he should be roasting in Hell...more likely than anybody else I knew at the time. I told her flat out I think he was a murderer.
Its a theory as to why gay ‘marriage’ leads to murder ... not as to whether murder-by-AIDS exists.
It does — though I would think there is at least a minimal amount of contributory assumption of risk. Not enough to absolve the murderer, but enough to wonder why the victim didn’t see the risk.