I think that many feelings are reactionary thoughts to a stimulus. The brain has differing thought processes (id, super id, ego, super ego), so some agree and some disagree. After collecting these thoughts about the stimulus we compare them to make a decision.
So, IMO, many thoughts and feelings can be safely ignored because we have judged them to be irrelevant or wrong for the given situation.
I once had a bit of a business mentor who said, to make sure a business succeeds you first have to work out how it could fail, and I find that true in computer programming too when validating user input.