I find this game a wonderful phenomenon, I've heard countless stories of people getting out, spending time with their kids or friends, meeting new people and having a laugh.
Every new fad is met with the standard hipster "I'm too cool for that, they're all stupid/idiots!" response.
I don't understand however, how anyone can risk getting run over. If you're crossing a road, LOOK! It's hardly difficult. Plus the game has a battery saver mode, where you invert the phone (i.e. take it away from your face and let your arm sit naturally by the side) and the screen goes black, but will vibrate if you get in range of a pokemon or pokestop/gym. There is literally no need to be staring at it while crossing the road or moving, even.
There's no accounting for stupidity, and with this many people getting in on it, there's bound to be some rare doofus' playing and getting hurt in unimaginable ways.