I like this:
Anyone can become angry.
That is easy.
But to be angry with the right person,
to the right degree,
at the right time,
for the right purpose
and in the right way.
That is not easy.
I think proper anger (see above) is a good thing.
Joe Strummer knew that ("let fury have the hour/ anger can be power/ do you know that you can use it?" gawd. I love that fucking line). So did Malcolm X. And Muhammad Ali. And Jackie Robinson was more angry than anyone really knew (all that turning the other cheek business is pretty fucking hard to do when baserunners try to cut you with their cleats. fuckers.) I like listening to Camille Paglia when she's pissed off...even when she feels betrayed by Madonna now. Oh, yeah, Madonna, too. I love her rebel-anger, ooh boy.
Sometimes it gets you in trouble, though. Like the man said, it's not easy to use it well. There's that line of pop-psychology that Melfi says to Tony at one point on the Sopranos (wow, talk about pop-pop...) she says that anger is just depression turned outward. I think that's usually true.
But...when you take a look around...how can you not be depressed and angry at the world...sometimes? Cuz, what's the opposite? Complacency? Got to rage against that shit, man. Not all the time...but take some time and get angry every now and then, because I think it means you actually care.