Maybe it's because those of us that started this site (back in June 2000) have grown up, and now have children of our own, and finally realize how hard it can be when something so innocent, so precious, and so young has to deal with something that they can not control, possibly with the fear of having there last breaths taken from them before they have the chance of experiencing all that life has to offer.

Or maybe because it's the cool thing to do.

I'll let you ponder on which one you think fits