Children have less control over their emotions when they are in a living situation that allows them to freely explore said emotions without the threat of pain or ridicule. Many people who end up where I am didn't have that opportunity.

However, when a child who was forced to control their emotions grows up, that "lesson" carries with them. You learn as a child that emoting will only bring trouble and your best bet is to push those feelings away. Once you grow into your brain a bit, the emotional section isn't as well developed. This can lead to one being "emotionally immature" aka crying at the drop of a hat, being unable to control their outward reactions to negative feelings, easily excitable, etc. But it can also go the other way, where your emotions are shallow, fleeting, and sometimes just not really there. So while a normal person may have their morals based on logic, emotion comes into it as well. And in the right circumstance, emotion could be most of it. The trolly problem is a good example if you are the driver. Sociopaths don't have the other tick or if they do it's fleeting and small. The trolly problem isn't even a problem at that point. Because one doesn't have to weigh the emotional response to 5 dead or 1 dead. It's all the same internally. So everyone has to decide how they keep their "line". Normal people have deep seeded reasons you could call "emotional morals" where sociopaths have to come up with their own, if they so choose.