If there are people walking around staring at their phones and NOT PAYING ATTENTION they could get really hurt or die. For example, Someone playing on their phones, They could walk into oncoming traffic and get hit with a car. Or in a subway, They could fall on the tracks.
Honestly. . . , WHAT. Pokémon Go is such a fun game. You can go outsize and inside catch Pokémon. Yes you shouldn't get to the point your running out on the road to catch a peckish, But honestly people should be smarter than that. You don't have to be obsessed but its fun and if your smart there won't be a problem.