evidently you do. its called being prepared...not hoarding ;)
sure a small percent do have OCD and the such... most are just people who want to see their family and friends cared for should the worse happen.
thats the whole point. no one knows how bad it would be today? it might be nothing... or it could nock out everything from computers to cars to planes and the such... and imagine the hell that could create. the odds are low. but i like playing it safe =D