You guys are kinding, right ?
The whole point of the manga is that by being shitty people and not taking responsability for what they've done(initially), they sufferring even more.
I actually got mad when it seemed that Renko seemingly didn't mind that Tobio accidently killed several people, because that would've undermined the moral of the manga.
I mean even now, Tobio stopped trying to seek redemption , he just try not to think about what happened.