I think if someone went back and looked at 10 years of Saints games and looked at situations and categorized penalties and tallied the calls/no calls on Saints vs opponents, then further categorized by officiating crew, the stats are going to show such a level of inconsistency that bias is the only thing left you can conclude.
We have all sensed this for years through collective memory of obvious inconsistencies that other than 2009 never seem to benefit the Saints.
This particular one seems to be galvanizing the collective consciousness of Saints fans, because we've seen it over and over and over.