NFL Gambling: Legitimate?

I'm not generally a sports guy, but Sunday's Steelers-Chargers game has lit a fire in the gambling underbelly of NFL spectatorship:

"There's no way a real Steelers or Chargers fan could have possibly cared about this particular ruling one bit — the Steelers had won the game either way. And trust me, the people who had the visceral responses to the ruling were not the ones wearing Steelers black and gold or Chargers blue and yellow. To put it simply — all these guys had 'other' interests in the game."