Adults commit assault all the time? I've never had anyone kick me in the head.

No, they generally outsource inflicting suffering to a third party.

One of my inlaws, for instance, sees no issue in themselves using a bathroom inappropriate for their gender, and also in having trans people imprisoned for doing the same.

Many people feel that rules do not bind them, but are a great weapon for beating other people with. It's a core pillar of their political philosophy.