Why are people in cults so childish?

Forbid you mess with them or get involved anyway and they follow you everywhere even online. Forbid you used to have a crush on a member and they send people to humiliate and mock you. Like they act like little children and it's mainly the men who act like that. I'm just wondering because I'm not talking about religion, religious people are usually kind and mature I'm talking about straight up cults. They are childish like I don't understand if it's because they not exposed to the outside world or what. They are behind in development they way of life is getting back at someone or acting like little kids.

Why are people in cults so childish?
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