That's not a get-out-of-jail-free card, despite the fact that it's generally used as such.First of all, it's for a good cause (and there are a few causes to choose from now that other charities have got in on the act, if you don't like ALS/MND).
I don't need to pour a bucket of ice over my head to have fun, and I don't need anyone else to pour a bucket of ice over their head in order to be "brought together" with them. Come to think of it, I'm pretty sure the human race has survived socially in the past without the need to pour buckets of ice over its headsSecondly, it's fun, raises awareness, and brings people together. This is what social networking was invented for.
Oh, and I don't need to pour a bucket of ice over my head in order to give to charity