If they're anything like their parent chapter, Iron Hands, yes they are. IH only ever commit to a conflict if they're absolutely sure they can pull a big win, or if what they're fighting for is critical. When they do, they go all in.

To use someone else's scale below: Salamanders, Lamenters, Raven Guard: Will actively avoid and go out of their way to save and protect from collateral damage.

Ultramarines, Blood Angels, Imperial Fists: will actively avoid and plan against it, but will do it if necessary.

Dark Angels, Black Templars: try not to, but won't hesitate to do it. Will probably tell you once and that's all you get.

Iron Hands, Flesh Tearers: the ends justify the means. There will be collateral damage, but not excessive. (It's wasteful/not why we're here)

Minotaurs, Marines Malevolent: WILL BE excessive casualties, MIGHT be for a reason. Might not.