We can say "they aren't the only team"...yet have never heard of any other team doing it. It's illegal in the game, and falsifying reports is a big deal.
We all have different morals and leniencies. Some people are more apt to be stronger in one area, and lesser in others. Belicheck's brain is just wired to where he has a deficiency in the area that tells him right vs wrong when it comes to cheating. He just doesn't see a problem with it, because his mind justifies the reasoning. He will always be a cheater because if the opportunity arises, he will take it. Then when caught, he shrugs.
(the previous comment was not directed at any particular individual and was not intended to slander,disrespect or offend any reader of said statement)