Its not really Mickey's fault Daryl's girl got killed
I mean Daryl's the one who decided to go rogue and attempt to run off with his girlfriend and the money, and Daryl's girl is the one who out of the blue decided to pull a gun out and act like an outlaw, and it got bullets flying at their heads and one of them hit her.
I'm by no means saying Mickey's innocent in all this, especially after everything in the finale with him hanging up on his daughter and then leaving Smitty to die alone in the street, he's a piece of shit. But everything that happened with Daryl is on Daryl, he's a grown ass man who decided to go along as Mickey's lackey knowing it wasn't smart. Daryl's also the one who decided to try and run off with the money which if he hadn't done that his girlfriend would still be alive.
Daryl's trying to not blame himself and just put all the blame on Mickey to make himself feel better.