An annual purge is the best way to cleanse society of homeless, illegal immigrants, the unsavory lower clssses and other undesirables. Or at least that's what the website alludes to.
That I could buy, but all the promo material I've seen alludes to it being a home-invasion slasher flick. :\ Of a fairly affluent family who has blast doors on their domicile.
So maybe it's the homeless, illegal immigrants trying to kill an affluent family and steal their home when it's totally legal. In which case, I don't think that's what the purge was aiming for.
*resists urge to give slow clap*
BeMi: I get how movies are made
I'm talking about it as a plausible concept that I personally find lacking. :\