Not to put too fine a point on it but people have been killed by police who have been fooled into believing a kidnapping or bomb situation is going on in a home because a deranged internet troll phoned it in.I don't understand why that is a problem. I used to post on forums giving my real name, address and telephone number. What are you afraid of? Some people on the forum didn't believe me, so one of them sent a post card and I had to describe it to prove I had received it. Some other people called me and we had some nice discussions on the phone. What harm do you expect?
It's called swatting.
One person that happened to had done nothing but beat someone else in a video game.
Fun fact, the reason we probably won't be seeing that ******** TJ Miller in any more Deadpool movies is because he falsely reported a bomb in the purse of a woman he fought with on an Amtrak train.
Granted, I definitely don't think this will happen to anyone who gives their private information out online. But I do think that is probably one of the worst things that could happen. Of course doxxing has led to all sorts of harassing behavior too.