For some people is the answer to their pain to cause other people to have even MORE pain?

~Misery loves company. Anger is a normal stage of grief.

Yes, especially if they think the other party is the cause or one the causes of their own pain.

I think that’s very human but to elevate humanness imo, one needs to balance things out. Do these people really want to hurt me or they are just like me who feel lost?

Hum. Yeah?
Seems more like a way to prove that there is a reason for so much pain coming to them.

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The “how”>
But not just pain is enough to make this conduct a reality; it is necessary loneliness (living by itself); it would affect the learning process about life–what would probably lead to an immoral point of view about the world and careless behavior.

What would help to avoid that bad conduct would be if the person guardian’s since the beginning had taught them about rights and wrongs.