I can say from a local standpoint, most fans feel like the Saints were just dumb enough and blatant enough for long enough to be the ones made example of for a frequently acknowledged, league-wide, decades-old problem.
Many here in NO pretty much feel though like the Saints weren't doing bounties past 2010 and want to believe the players who have stated as much. It's seemed obvious to many of us that Williams wasn't acting the same or being treated the same since the SB, and some people speculated that there were issues between him and Payton, with those speculations taking on a new dimension in light of all this business. Bottom line though is that the performance of the defense since 2010 has frequently seemed pretty terrible, and if anyone on defense was getting illegal bonuses for their play last year, then there's more lacking in this team's judgement than just morals.