They are quite correct.
The purge movie was fine entertainment but not realistic for many reasons.
The premise is not the fear of what would happen on such a night but instead that many people would respond to such a lawless night with murder rape looting etc.
No doubt some would but probably not most.
Here is a much more realistic list of actions which people would take if all laws were suspended for a night.
"When Faith preaches Hate, Blessed are the Doubters." - Amin Maalouf
welp, just checked google news, and it looks like it didn't happen. pretty much like every other inflammatory / scary urban legend on facebook.
here's another cool pic from Chicago, though.
This has all the makings of internet hoax/urban legend. I highly doubt this will happen.
Freedom of speech is not freedom from criticism.