A cinema in the UK called the thugs to arrest some 12-year-olds for bringing iThings with them to the movie.

The fact that they did not in fact record the movie is a side issue. What if they had done so? Since that is not a crime in the UK, the only complaint the cinema could make is that they violated its rules. That should not qualify as an "emergency" — the thugs should have refused to come.

This is in addition to the general point that laws against sharing copies of published works are an injustice.