1) There's far too much emphasis on being happy these days.
2) Trying to 'contain' sometimes makes one numb more than alive...

my only concern with anger is not no project or displace personal feelings that are not related to the real situation...but to be furious when it is right to be furious, it seems to me a survival tool.

Anger has the same root as anxiety (literally, in an etymological sense, a sense of strangulation). Positive channeling of anger and anxiety has its uses, but in the longer term perhaps the roots of anger should be the focus?

Indeed. I have benefited much from cognitive therapy, which trains you to see realistically, rather than with self-induced exaggerations based on false pre-conceptions (eg, "If anything else goes wrong, I won't be able to stand it.")

Anger is a relief from low feelings like depression and fear so can be construct in that it gets you out of a low but you should then either let it go of move up the emotion scale till your back to normal
I find that channeling anxiety or anger into action helps rather than letting it destroy you or others