A news story just popped up about a person in Chicago using a radio to impersonate transit workers and causing bit of trouble for people using Chicago trains. No one was hurt by his pranks, but this could have been a much more serious story very easily.
Now some may try to use this as a reason to have radio licensing more heavily enforced, but that would not have stopped any of this. However, if you wonder why two way radios are often limited in broadcasting power, this is one of them.
There are always going to be people like the one in the story. If you misuse radios in this manner you probably will be caught eventually. When someone does something like this it does have ramifications on everyone in the radio community. So people, use some sense when you operate a radio.