>>Some mental landscapes are disorienting, others actively dangerous.<<

On a purely practical scale, broken things have sharp edges, broken minds/souls are no exception, and if people insist on being pushy about it (or actually caused the damage)... Well, kids learn to be careful with sharp things after getting jabbed, and some adults need a refresher on the lesson.

Or a variant: I am not exactly the idea of a 'normal' person of my age, gender, and appearence... and depending on your type of otherness, letting that out can confuse or intimidate people into going away. (Not always, but sometimes.)