You can attack both when the people trying to warn you are incompetent. This was an obvious second order effect; if they tell businesses "we don't want you to do this, so you can't unless you put up a sign" it should never be a surprise to see signs sprouting up on the landscape.

Teenagers could have predicted this was the likely outcome.

Whoever wrote it was either incredibly incompetent in not predicting this outcome or intended this outcome.