TVs when I was growing up generally were built to last, the screens were fairly thick; the case was generally wooden. It was very difficult to destroy the bloody things, even the 14" I had in my room an old Sony set; had ridiculously thick plastic case.
But these sets not only were built to last, but also weighed a flippin' tonne. Nowadays the emphasis is on providing the best size for as little money, as well as making everything as light as possible.
Plastic is far thinner for most TV sets and if you threw rocks at any fairly modern set you can expect nice holes to appear if not kill the set entirely. If you're going on pure angle, then honestly it looks perfectly fine to me...
god knows how you bowl, but generally the idea is to make sure your arm is straight just before you release the ball; if you notice the wiimote might've traveled a fairly parallel flight, it's angle suggests that it was done from an underhand throw.
Again if you think about how much force you generally use in order to throw a bowling ball down a lane, the sheer shape rather than weight would be far more of a contributing factor to how well it'll peirce something.
although sure the wiimotes aren't exactly heavy, they're still much heavier than any of the remote controls we have here. I can see them doing serious damage if they were thrown at something either intentionally or unintentionally.. in-fact I know how much they hurt after my lass lost a game of boxing to me and being the nice sore looser she is, decided to lob the wiimote at me. Got a nice bruise on my leg where it hit. (and I don't tend to bruise easily)
as I said, these doesn't seem unreasonable or unrealistic that someone could've done this. still saying that whoever did it was being a retard though.
Intel Core 2 Duo E6400, 512MB DDR2 667MHz, ATi Radeon X1900 XT 256MB PCI-E, Windows Vista Business / XP Professional SP2