I'm told that anger is an unhealthy tool.  That one shouldn't use it in such a way because it's a crutch.
To an extent I think that's true...  for people that don't understand their anger or how to direct it in a helpful way. 
Is it healthy?  No.
Is it unhealthy? I'd say it's fifty-fifty.  
Personally I believe it depends on the source and how you use it.  
But that's kind of anger in a nutshell.  It can be destructive, but it can also be useful. 
Just like any tool one should use it wisely.
COMMENTS
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BloodLordOfSouls
07:54 Feb 10 2018
Yes, anger can give you strength, but, it can also eat you up inside. Believe me, I speak from experience.
So, you need to be very careful with it.