Some of what you say I agree with, other parts not so much; I certainly don't feel that once you have experienced an emotion enough, it will disappear.

I'm sure that it may be that way for you but not neccesarily objectively and in general terms otherwise as an example all people who were to suffer from depression would eventually find it fading away or someone who had issues with anger would after a period of being aggressive and violent become more balanced and peaceful.

Although no one says it, much of this behaviour is simply accepted because the huge majority of people on the planet (me included, I ain't no saint for damn sure!) have some level of anger, fear, need, judgement, desire etc and it thus becomes somewhat of a default level within that culture.

Hypothetically, If you were to live within a society that wasn't angry, fearful, judgemental, needy etc but instead were utterly loving, generous, warm, caring and so on, then the chance of a person feeling this negative emotion would be slimmer beyond recognition because behaviour in relation to that society would be abnormal and absurd

In conjunction with this, I beleive that we pick up thought patterns and breaking out of them requires effort and an awareness of them existing in the first place. Thought and emotion can be highly addictive; The more we do it, the easier doing it becomes.

Recently I've been trying to perceive difficult experiences that have the potential to make me feel negative simply as a challenge. Will I let this get me flustered, frustrated or angry or will I instead decide to not let it have an effect on me?
It has certainly been interesting

I agree though man, It isn't enough to simply understand a concept on an intellectual level, you have to know it to be true through your own personal experience and intuition

Great post Brian