If you are talking about parents giving their children a device to use as a weapon against them, you are implying some really bad parenting and really bad general human behavior by some other parents.

Not that there aren't some really lousy parents out there.

I suspect/hope the exclusion parenting style (you don't get a phone because I don't trust you with it or the rest of the world with you) and the guidance parenting style (you get a phone but I'm going to make sure to talk to you about responsibility and about lousy people in the world, and I want to know if something happens so we can keep talking) both far outweigh this sort of proposed 'entrapment' parenting style.