IIRC, there's a Terry Pratchett's quote that says something like this: "(...)you should be afraid of that cashier at the supermarket that quietly is being yelled all the time until one day he appears with a shotgun".
The worst thing you can do is avoiding anger because sooner or later you'll explode. Learn to handle it or burn all that excess of energy on something useful but never avoid it.
I wholeheartedly disagree with the OP of this line of commentary. Saying anger is good and one should embrace it is a really bad suggestion.
Anger makes you blind, it fogs your rational thinking and makes you do things you'll probably regret afterwards.
So, avoid it and think rationally.