I think we've established by now that child abusers are not necessarily paedophiles, but inevitably society will refer to anyone who abuses a child as a 'paedophile', when actually they're more likely to be a 'perfectly straight' friend or relative, acting opportunistically.
Similarly, although not as regularly reported in the media, anyone who abuses a dead person will be regarded as a necrophile.
Quite frankly, I think there's a breed of abusive people out there who are simply opportunists, who will prey on whoever happens to be vulnerable. It's about power, or dominance, or something like that. It's not related to the feelings that most people from all orientations have for whoever they're sexually attracted to, and I don't think ratios of abusive people differ much from orientation to orientation. Necrophiles and paedophiles however, are going to take the flack for many crimes of opportunist predators, who find children and the deceased vulnerable.
Take Jimmy Savile. That bastard's growing list of crimes are now known to have included acts of necrophilia, so he's now known as both a paedophile and a necrophile - but I honestly don't think he should be regarded as either. What he was, was a predator. Pure and simple. He preyed on whoever he believed wasn't able to resist him. He didn't look at his victims and think: "I like him/her..." He thought in terms of having power over them and what he could get away with.
I know this will fall on deaf ears in most places other than this forum, but the propensity to sexually abuse another human being has got to be separated from the attractions that people have. Nobody seriously suggests that all straight heterosexual men are like, say, Peter Sutcliffe, yet paraphiles have to put up with mud thrown at us because some opportunist predators, who don't necessarily share our attractions, have found the type of people we like in vulnerable situations and have abused them simply because they can.