Maybe in order to understand mankind, we must look at the word itself. Basically, it's made up of two separate words, "mank" and "ind." What do these words mean? It's a mystery, and that's why so is mankind.
Cop: You’re driving on the wrong side of the road. Me: Sorry, I’m English. Cop: (shouting) It’s the wrong soid of the roade ye was droivin down, innit?
I guess we were all guilty, in a way. We all shot him, we all skinned him, and we all got a complimentary bumper sticker that said, "I helped skin Bob."