Yes, our defense can be better. But in fairness, if fans (and I was one) are going to criticize Dak for "junk" yards in games where the Cowboys were playing catch up, then we have to take that into consideration for games the Cowboys have well in hand and are just giving up yards to burn the clock.
It works both ways.
I think the defense has confidence in the offense and slacks up a bit. But ... I think it will get better down the stretch with D.Law, Gallimore and, possibly Joseph coming back. I think we're seeing the confidence of the defense grow. And with another speedster in the secondary and another pass rusher augmenting Gregory, we're about to see better defense when it starts to matter most.