Beneath his cowl, Tim rolled his eyes. No reason to help? This would be an open and shut case, without doubt. And while Oswald might have flirted with more than one prison sentence in his time, this was different. This was the murder of Bruce Wayne. There would be no slap on the wrist. No get out of jail free card. Oswald would be crucified by all of the men and women that Bruce had helped over the years.
"Think about it, Oswald. Gotham hungers for the killer. If I take you in and lock you up-and believe me, I will-there will be no saving grace for you. And even if the true killer is eventually caught, your image will forever be marred."
There was also the option of beating him into cooperation, but he did not mention that.