I am not a trained psychiatrist, but I'll go out on on limb here and suggest that Cosmo just might be a little off balance.
That doesn't preclude my suggestion. In fact, it strengthens it. A lot of queers have other serious mental issues that go way beyond just being queer.
Of course he could just be a run of the mill homicidal maniac that isn't queer. There have been some of those in the history of serial killers, but they usually kill women.
Generally the serial killing of males is a homosexual thing.
Cosmo’s Death Factory. With all due respect to CCR.
Possibly the last thing some of his victims ever saw.
yikes