Should DPS Death Knights learn to Tank?

Good topic on wow insider a while ago asking if Healing priests should learn shadow, and it has resonance with a DK’s dps role. So I’ll rhetorically ask:

Should DPS Death Knights learn to Tank? And vice versa?

I’d like to give you a balanced and well rounded opinion on this, complete with examples and war stories, but I can’t. The answer is so bloody obvious it makes me wonder how you could have the opposite view – my answer is by hell and damnation they should.

Everyone will play better and understand roles better when they have a wider set of experience. If you have not done it, go try a different role in 5 mans. Do 20 runs in each role, and then see if it changed your attitude.

Disagree? Please tell me why.