The "rationalist world-view" is just noticing that (per #1) what brain tells you and what the world really is are two different things, therefore your emotions may or may not be properly aligned with reality (btw. this is also the primary insight of Cognitive Behavioral Therapy). Emotions are just like opinions, but in different part of the brain - you want to have ones that correspond to reality.
"Contrary to the stereotype, rationality doesn't mean denying emotion. When emotion is appropriate to the reality of the situation, it should be embraced; only when emotion isn't appropriate should it be suppressed." - http://wiki.lesswrong.com/wiki/Emotion