And self control is self-learned. We all restrain ourselves when we resist a temptation. A temptation is, to me, an evolutionary mechanism. People tempted to murder often are tempted for power or revenge, revenge effectively being an eradication of a threat. This can be extended to a lot of human behaviour.
Rape is an instinctive urge.
We don't not restrain ourselves there, if we need to be restrained in the first place. Greed is a powerful incentive here too - one we can see in politicans the world over. This is entirely what civilisation is - a taming of the beast instincts within us with devices such as legal systems and belief systems. But I doubt a very sinister one, but 'merely' a chaotic one. AS regards people who feel there is something profoundly wrong with the world, I believe there are many.