Some people on this Earth are like for real messed up in the head, which might be caused by childhood issues/demonic possessions or actions, or they are just straight up crazy. Everything said by someone has a role on what happens to them, if you bully someone; they will most likely return that bullying by either a fight or by killing an person or taking his/her own life. The main reason why so much crime is happening right now in America is the people in the country. Most people talk trash, mess with others, pull pranks, and overall piss people off.
When someone says a nice thing, nice things come from it, when someone says something negative, bad things come from it, by eliminating the bad words said; people would be better, not saying that crime will dramatically plummet, but it might slow down. There's a lot of rumors circulating about the ISIS cutting people's heads off and such, just recently, there was a man who got fired and he cut a women's head off and started stabbing another women, he was Islamic. Not to be racist, but some Islamics are pure crazy. Putting all that aside, focus on the positive in life, live it to the fullest, it's too short to worry about this kind of stuff.
Conclusion: Don't think about the negatives in life, think about the positives and be happy. Crime will happen and wicked people will exist, there's not much we can do.