Why? It's meant to try to break up the DP, not to try to hurt anyone. If the MI isn't a moron, he won't ever get hurt. It's meant to cause you to rush your throw, drop the ball, etc., no baserunner expects the MI to just stand there and take it, hence Swisher's shock that Nishii didn't move out of the way. It's Nishii's fault for not knowing, and the Twins fault for not teaching him. The takeout slide is not dangerous if the MI reacts properly. Should you just stop running and concede the double play?