Couldn't this guy like cut his finger off or something? The last thing I would cut off would be that. I'd hate to be the cop that got hit with a penis.
We're a strange race aren't we. I mean we have Morris Dancers, some people actively damage their bodies through smoking and drug intake, people push their physical limits just for the fun of it, some people are okay with killing, some people are vegan, some will spend thousands on speakers and donate nothing to charity. We dye our hair and paint our bodies.
Cutting off genitalia and throwing it at police folk is just another in the list of unusual things.