I know that jumping onto a professional playing field, at any time, is illegal. Doing so during a game is deadlevel duchebaggery. Not that it has to be unfunny.
Some places nicely herd you into a corner, where you are taken off the field, then probably beaten with rubber hoses before being turned over to police. Some places, you are roughly tackled by seven guys that couldn't cut it in the NYPD's interrogation unit. I am just saying using a taser to more quickly bring about what is an inevitable conclusion, with less interruption to the game, less likelihood of public beatings, and is great entertainment for those of us that stayed in our seats is a good thing.
Put it this way, I'd rather be tased than have Shane Victorino decide he is unhappy with my antics and take matters into his very substantial hands.