As for Kasey Kahne and bad luck - when one driver blows tires and crashes so much more than other drivers, you have to, I don't know, look at the driver.
I say the same thing about Kyle Busch and his engines. Yes, all the Toyota engines suck - but when one driver blows engines so much more frequently, you have to wonder what he's doing different. Yeah, it's the team's job to give the driver a car he can drive and drive wide open - but when some drivers (Kahne, Kyle Busch, Montoya and, to a lesser degree, Kurt Busch - among others) seem to drive the car beyond all possible limits, might be time to look at the driver.
Of course, for Kurt Busch, he's really got nothing to lose from driving beyond his car's limits. If he picks up a few wins, it'll be a remarkable feat (and he will). Kyle Busch and Kasey Kahne on the other hand - they could win championships if they knew when to slow it down.