I highly disagree. While I think crying is fine, and could be beneficial on many occasions, what I define to be tantrums: screaming, throwing, hitting etc are not desirable ways of channelling emotions and dealing with stress. Kids eventually grow up to be adults, so we teach them, gently and at a suitable pace, to act as responsible adults. It wouldn't be fair to let them tantrum as a child only to one day find out there are real world consequences for acting like that.
Of course, that is not to say we should ostracize kids or parents with kids who act out, dealing with emotions in a socially acceptable way is just something we need to teach our kids, like potty training.
To say that well behaved children are repressed is just plain wrong. There are experiments which show that children who have better self control perform better in life.
People (kids and adults) are allowed to be crabby when they are low or ill, then they get better and we expect them to act better, I don't see that as an excuse to say let's not try to correct the tantrums.
