It is interesting how easy it is to discern the former bullies and the bullied here. Like in those threads about OW, where one can easily see the wives and the OWs.
I was both, which blows that theory out of the water.
Bullies ALWAYS know what they are doing. Always.
Also not true. I was autistic and didn't know it. I copied to fit in. Unfortunately the role models I chose to copy were my siblings, who bullied me mercilessly from the day I was born. When I look back to school, I was pretty horrible, saying all the unkind things that popped into my head without a thought for anyone else's feelings. I thought I was being funny, because whenever I had got upset, my siblings told me I was overreacting because they were 'only joking'. So of course I thought my victims were overreacting too.
Many dysfunctional families have the kind of dynamic where one child becomes the repository for everyone else's negative feelings and behaviour. Unsurprisingly, that child ends up 'acting out' all of the accumulated pain, which is why you've seen families where everyone appears to have been raised the same way but only one has gone off the rails. But the whole family is out of balance, not just the one.
Anyway, all of my stuff was a long time ago. I've had an autism diagnosis, many years of therapy and am no longer in contact with my family. And I've definitely changed.
I'm not saying all bullying comes from a place of victimisation, but a great deal of it does, which leaves open the possibility for change and growth, and that was certainly true for me. Perhaps other bullies start off nasty and stay that way. My real point is that bullies, like almost all groups we like to label and 'other', aren't some homogeneous group who all behave the same way and are driven by the same impulses. They have as much opportunity to change as most of the rest of the population, and perhaps slightly more incentive, given they are generally unhappy and disliked.
I don't believe in evil or that anyone is born evil. But many, many families have unresolved intergenerational trauma that affects children from day 1, which is why it looks that way.
I don't want to be unkind, because it's clear you're hurting from past experiences, but I think you could do with taking a bit more interest in human behaviour before writing off a large proportion of the population as evil and likely to stay that way.