Who cares? It is a rule they are reminded of daily, visually and/or verbally, that risks a lifetime ban. He ignored it and knowingly disregarded it. A one year suspension is getting off easy.
As for insider knowledge, he was betting on the Falcons.
According to an ESPN report, the bets took place on a mobile phone and were placed out of state. The bets were reportedly "multi-legged parlay involving 3, 5 and 8 games that included the Falcons to win, per source."
That his bets were small and insignificant really doesn't matter, he has access to players, knows who is a healthy go, and other information that would influence his bets. If he bets the Falcons to win 3 weeks then doesn't bet on them week 4 that is a signal to others that his information makes that a bad bet.
That is the simple reason it can't be tolerated from players, coaches, or officials at the most trivial of levels.