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You can quit or not join in the first place.

I have no ruler, or leader as you call it, who's opinion stands above my moral compass/conscience.

This video explains well what Law is.

But before you enter the course of being a cop, there's a lot of briefs and you can search what you will, do what to do and what are the rules that you need to consider.

I think that SWAT knows what is right and moral for him.