Exactly. We see the percentage of serial killers who are homosexuals at least double that of heterosexuals. That's a whole lot more than a mere 5%.
No, we established that about 14 % of serial killers
might be gay or bi (at least in that particular sample.) So about 86 % of the sample was straight. The claim is that the percent of "gay" serial killers should be smaller, in line with the estimated percent of gays in the population. Trouble is we do not really have a good estimate of how many gays there are because some are not "out" to census takers. Another problem is that "gay" has been used as a catch-all category in regard to serial killers. If only a few straight victims and but many gays, thats gay. If only a few victims are of the same gender, thats still gay. If the killer has a male lover and straight victims, that's gay. If the killer is married with kids, but same sex victims, thats gay.
Also, that five percent dealie refers to the chance that the relationship actually does not exist at all. One in twenty stats / results are just incorrect and were an artifact of chance alone in the particular sample, Comprende??