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The fish symbol was used by early Christians as a signal or "password" so to speak when gathering together under threat of prosecution. One individual meeting another that said they were a believer, would make the first line of the fish and the other would finish the symbol as a form of password or proof that they belonged.
Justifying the "evolution" mutation of the Christian symbol is lame. It is a perversion of the symbol, similar to those that display the cross turned upside down. Both are just an attempt to intimidate those that non-believers fear, Christians. Real Christians do not become violent over something so childish. If those gentlemen were Christians (did they really say they were?) then would not have been so intolerant. Disagreement is just another sign of our humanity. Destruction of property or vandalism are criminal acts.

If this is a true story, I see no value in complaining about it. In stead of complaining to us, like we are to blame, the authorities (Social Services?) should have been contacted and a complaint made.
Being "old" is not a crime
Being "white" is not a crime
Being a "Christian" is not a crime.
Being destructive IS a crime.