Officiating in the NFL has been under intense scrutiny recently, and something like what happened on Sunday in New Orleans doesn't exactly help the league's case.
To be clear, nobody thinks the games are rigged -- at least, not normal people. Where the line gets blurred between conspiracy theorists and fans with legitimate gripes is the lack of accountability for what seems to be a consistent amount of bad calls.
The center of the Venn diagram is referees simply not doing a good enough job at the only one they have. It's not because they favor one team, it seems to be that they've just lost a lot off their fastball.