I don't know if anyone is capable of playing good defense. Players like Ferry, Barry, NVE and Ward have all tried to play good defense for the Spurs ... but they just don't (or didn't) have the athleticism to pull it off.
The Celtics have good defenders. Garnett has always been a very good defender. Rajon Rondo might be the best young point guard defender in the league. James Posey is a defensive stopper when he puts his mind too it. A player like Pierce has never really played good defense but he's always had bad defensive players around him. I think the Celtics' rise to prominence defensively is mostly because they added good defenders to their roster.
The Mavs is a bit of a different story. Nellie doesn't really stress defense at all. AJ just brought in a new emphasis for that team. Players like Devin Harris and Josh Howard were good defenders before AJ even took over.
That said, you do have a point if you are talking specifically about the Spurs. This team in recent years likes to build up their defensive intensity as the year goes on. Their level of defensive effort increases as the year goes on and their level of defensive effectiveness also rises ... so yeah, in that sense, defense is all about effort and desire.
But even if Pop and Pat Riley co-coached a team that consisted of Steve Nash, Brent Barry, Antoine Walker, Boris Diaw and Amare Stoudemire .... that team would still suck on defense no matter how much they tried to inspire them.

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