The simple answer is that many people believe Bittorrent and other fragment-download programs (Emule, etc), when used for DAYS or WEEKS consecutively, can put a large amount of strain on your hard drive and damage it.
Usually if your drive fails, it's for a reason completely unrelated to bittorrent; it's my belief that these claims are mostly bogus.
People kick, knock, hit and abuse their computers constantly, introducing dust and vibrations into the harddrive, where it of course fails after a single freekin' year...and they blame Bittorrent? I don't think so.
Yea, I figured, but if you got a bossy sister who knows nothing about computers yet tells you "you cant use bittorrent cause you'll break my harddrive" then thats something.
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