What you're describing seems more accurate about mass killers than serial killers. I'm not sure that your average serial killer can't get laid, hell a lot of them are married. But there does seem to be a sexual component to most of their crimes. I do think that too much porn can possibly be a factor with both though, mass murderers and serial killers.
This isn't necessarily the case or prevalent with serial killers, I think. Different mindset from mass murderers.
Indeed, you're likely correct and I conflated the 2. In a genuine case of "different culture, hard to judge", I can only go by my general understanding of what motivates men to gauge what makes joe average Muslim become a violent extremist but since the 2 primary motivations for men are getting pussy and getting to have fun, it seems generally applicable to any guy not getting both when combined with certain other circumstances, e.g. strong feelings of jealousy that are projections of the person's own feelings of inadequacy. It seems most of those people are pussies who continually waffle between pretending they want to improve themselves and indulging impotently in hateful fantasies, while there's a small subset that craves their own destruction but being the pussies they are, they want to do it by causing pain to the people they've taught themselves to hate.
Just an aside. I don't know much about serial killers other than some general points. I find it to be a grim and depressing subject, and given the unlikely chance of becoming a victim (in which case it will be moot) I feel like I have the luxury to remain ignorant. But I'd say it's because they can. Once you convince yourself it's ok to do, killing someone is relatively easy. Since most murders are by people the victim knows, it's a lot harder to catch someone offing random people.
On the actual subject of the issue of what is being taught and to whom, I have a somewhat divided opinion and since I don't have children, I'll say only that I think we have an entire generation of parents who don't discipline their children, so in education in general, the push seems to be to get kids from an early age to be nice to each other in every way they can think possible.
The problem with that is there are always going to be children that are not with the in-crowd even at a very young age. There is some mention of inclusiveness in this method, but it's almost entirely about being nice. This wouldn't be necessary if instead, the push was on teaching parents to discipline their kids.
I know it's not right to strike a child, spanking or otherwise, because people tell me so. My opinion is that my father never laid a hand on me I didn't deserve, most likely. Either that or he was an abusive parent. Hard to say, isn't it? What I do know is that I grew up believing in respect for my elders and for people I didn't know. Young children are going to pick up on the behaviour of their parents regardless of what happens in school, but someone needs to make sure children know there are consequences to their actions and I'm not sure how else to do something about that. Accountability training?