You know there is a strap on the wiimote that keeps you from smashing your tv with it
Good luck on talking your mom into letting you buy one
Most of the accidents leading to TV/window/mirror crashes when playing Wii were caused of the piece that connects the wrist starp to the Wiimote breaking.
This "Wii playing destroys your home" shouting in news has made it's job. Parents don't let kids have Wii cause "the playing might destroy our room decorations".
And most of the accidents were result of 24-48 hours of maniac Wii playing in the first days when the machine was released. Sweaty hands + tireness isn't good combination with Wiimote.
When you play "normally" (not a 24h marathon) and you are not tired you practically can't end up with accidentaly throwing the controller out of the window.