When they're barely a toddler, yes. But we have more sophisticated ways of exhibiting emotion an discussion. It's called language. Teach your child to express themselves verbally, not through guttural wails and grunts.
Crying disrupts others. Encouraging the disruption of random people isn't necessarily what I'd consider an encouragable trait.
Moreover, crying is an expression of severe emotion. If all you can do is express severe emotion, however, then you cannot function well in society. You need to learn to express yourself in more detailed ways. Ergo, teaching children to emote properly is one of the things most parents refuse to acknowledge. I personally think this is due to parental instinct and not so much the hatred of the idea as, invariably, the parent will teach the child how o act properly.
Every one of my friends' kids act VERY well because they are expected to act a certain way. If they're angry, they explain why. They don't just go into a crying tantrum instantly. Moreover, because more is expected of them, they're also advanced in educational placement because they can express their concerns. They're happy, healthy, creative, and playful. They still have learned how to act properly.