It's good that you highlighted this issue. I think many people who want to take a spiritual path and free themselves from suffering have adopted the notion that "negative" emotions are bad and living in "bliss" can only mean a constant state of joy where bliss is generally meant in the context of being at peace with whatever emotions are arising and allowing them to be, as you say, feel into them, rather than feeling you're wrong to have them. Suppressed emotions or emotional avoidance are where the problems manifest into such things as addictions or indeed anger issues. Sometimes anger is absolutely necessary to establish your boundaries, unfortunately sometimes people may try to take advantage of one's good nature for example, and one may need to get a bit stern to let one know that one is not a fucking mug.
RE: How Much Anger is 'Normal'? The Role of Anger in Evolution And Maintaining Free Will / Balance.