self justification anger

The anger used by self to justifying some actions.

example not coming to mind., but I find myself fuelling up the angry so I can do something. In my mind, This action is ok for an angry wronged person to do.  but that action is not ok for a not angry person to do. ( cant a person be wronged and non angry? duh!)
May be this is common in those people who think they are genuine,straightforward and truthful, The anger is not required for people who think of themselves as willy, smooth operators. It is just a strategy to get some results and there are no qualms about it.

[ I say "who think of themselves as" because, I "am" not straightforward but I "think I m" straightforward. BTW This is just an example I m actually straightforward :P ]

yes! one example

I was repeatedly getting emails/calls from this website , they wanted to help me write a book. I told them repeatedly that I am not interested but they kept calling.
I wanted to tell them shod off in a crude way so that they dont bother me again.
I felt awkward and embarrassed to write that email - qualms.
I found myself working up to be angry, these money minded bastards etc etc... I have right to be angry with them. ok now I m angry.
I told  them  to - whatever and more :-)

Now, I dont need this justification anger!! Do I really need to counter those embarrassment and guilty "qualms"? Anger is worse?
May be I was this angry young woman because I was not smart young woman!