Understanding Sawada is fine. Pitying him is fine. Excusing his actions isn't fine.
I'm pretty sure the plot isn't going that direction, because of the atrocities committed by Sawada and his followers. And Tomo, as much as I doubt him, also wants to kill Sawada.
This chapter also shows that Sei and co. having taken the hard route actually paid off so far. Not only are several of their numbers alive, but the women responsible for stabbing Tatsumi and Minoru are already using Sawada as a scapegoat for their actions. Cap had a lot of points to make, but he inadvertently shook their faith in Sawada.
On another note: Cap proves yet again just how far he's come from just being a background character.