So the police arrested the two who were answering a question by quoting from the Bible and not the hecklers who were harassing them.  It's on record.

First, because the transcript of what the preachers said – which was filmed by them – shows that although they were subjected to considerable verbal and crude abuse by hecklers, they responded politely. Yet the police choose to arrest them instead of the hecklers.

Should there be a situation where a person is doing nothing illegal but can be arrested because of the behaviour of others towards them?