This article from CBS Sports talks about why the Steelers and Tomlin felt okay resigning Sutton:

Steelers head coach Mike Tomlin went back to his personal relationship with Sutton and the process of due diligence led the veteran cornerback back to Pittsburgh. This was enough for the Steelers to feel comfortable in bringing Sutton back.

"There are not any conversations that we had recently, it's the totality of our relationship," Tomlin said, via a Steelers transcript provided by the team. "I met this guy in Knoxville, man, six, seven years ago, whatever it was, when he came out of school. He's a great guy. He loves football.

"It's probably the totality of our relationship and I probably represent the sentiment of the organization and saying that it's less about specific conversations, particularly of late, and it's about the relationship established over a longer period of time."

The Steelers cornerback eventually surrendered to authorities and entered a pretrial diversion program after the charges were reduced from a felony to misdemeanor battery. Sutton was also required to take a mental health evaluation upon the agreement.

Sutton was signed by the Steelers to a one-year contract earlier this month. The Steelers are aware Sutton is subject to potential punishment by the league.

As Tomlin was asked if the Steelers are comfortable with their process, he responded the best way he could.

"That's just due diligence," Tomlin said. "That's what's supposed to happen. ... Obviously he's here."
WTF does this statement even mean? It is a few sentences about nothing at a Seinfeld level. Look I know this signing might help the Steelers and I like that as a fan, but man this league just lets these guys get away with a lot of crap that would land other guys not in the NFL in jail for a long time. I really do hope that Sutton works through these issues personally and learns from it but getting paid millions and required to go to a program sure isn't punishment.