These are quite possibly ‘dry runs’. If that is, in fact, the case, once enough of these have happened and the political correctness demon causes authorities to not intervene and, instead, look the other way, the next attack will occur. Be aware of your surroundings.
If something begins, don’t be a scared kitten victim, but do something about it. Chances are you are going to die anyways, so why not attack the perpetrators as a group? You at least have a chance.
During a plane hijack, a criminal gunman in a public place, a kidnapping, or even a rape, this is not the 20th century anymore where the perpetrator does his/her deed and leaves you alive. There is a good chance you are simply going to die so try to stand up and do something about it. You most likely have nothing to lose . . .