"And indeed a portion of them do the fucked up things right now. Are they practicing?"
Sociopaths are natural predators, designed to kill without guilt or remorse. One could say they are the perfect killing machines, if it weren't for the fact that they're often reckless and show a complete disregard for social norms, rules, and obligations.
They don't make good soldiers.
The way I see it, a sociopath is nothing more than a predatory animal in human form. Though, unlike the animal, sociopaths can be self-destructive, caring primarily about pleasure-seeking to the point of risking their own lives to get it.
So, what are sociopaths good for? Maybe in the grand scheme of things they really don't serve any specific purpose. They simply exist.
"Think of a fast evolving worldwide disaster which leaves us with little access to resources. Money is useless. What advantages do you think sociopaths have over the rest of the population (sociopaths versus empaths)?"
They don't have any specific advantage over the rest of the population. If only sociopaths survived a worldwide disaster, the human population wouldn't last very long.