This is a tough call similar to the Jarrett Jack injury. Or I think there was a Seinfeld episode where Jerry has a devil and angel of himself on both shoulders telling him what to do.
The best for the Celtics would be if Brook Lopez had a season ending injury. But at what cost to our personal dignity? I mean that if it happened, how many of us would feel the same inner turmoil as Rollie? I even think that some who would say they're never happy to hear of an opponent's injury that helps their team is just saying that as holier than thou.
The human condition, with all its positives and negatives, sometimes becomes a factor on message boards when all we really want is a copacetic atmosphere. Real life is very messy and the NBA and everyone including us are no exception.
I think your question is a good one and one that I, along with many others here, have thought a lot about. My ultimate resolution is that we are, for the most part, on solid moral ground. The reason I say that is this:
Nobody here is wishing Dirk or Brook a season-ending injury per se. What they're wishing is that their teams fail, which would likely happen without their star players. Obviously, the most expedient method for removing a player from the court is an injury, but again, we're more about the result (the loss of the player) than we are in the method. To take this idea to an extreme, a best-case scenario for us would be if Dirk and Brook decided that they were madly in love with each other and ran off to become sheep farmers. Great outcome for us, great outcome for D&B. Not so much for their fans, but 2 out of 3 ain't bad.
If the question is, "Given a choice between a season/career-ending injury to one of the above or a worse draft pick," I'm pretty confident in saying that most of us would choose the latter.
Mike