Maybe Doc has a point about the refs. Or maybe the Celtics just aren't being aggressive enough in the paint and on dribble drives.
The Celtics rank fourth in the league in free throw percentage (79.3), but only 17th in terms of free throws attempted per game (22.1). After Saturday's loss in San Antonio, Celtics coach Doc Rivers lamented his team's inability to get to the charity stripe, noting how free throws not only provide easy points, but allow a team to get back on defense and get set after makes.
Actually, I think the fact that the Celtics have so many jump shooters is what keeps them off the free throw line. But whatever. I'm sure it is all the ref's fault.