What I really can't understand about evacuations - most of the time there is actually quite a bit of advance warning for most people (at least those outside the immediate danger zone, which tends to be small). That means there is enough time to prepare even if you don't keep any BOB/emergency supplies. In my book, 15 mins is plenty to get everyone dressed properly and grab the critical supplies. But for some reason, most people just fail to prepare themselves adequately and leave their homes in inadequate clothing and footwear, with minimum water and food if any, let alone all the other stuff they might need in the event they couldn't return for a day or longer.
That's something I've experienced first hand but could never quite comprehend. Who knows, maybe it's just the human nature these days. As much as I hate that word, "sheep" really describes it well.