I think the problem has been that emotions have been judged as antithetical to the good.
As rationality seems to tend to be short-circuited by strong emotions, or more nefariously tends to bend perception to support the seemingly (from other perspectives) arbitrary emotional premise... it would be easy to look at this and say "emotions are bad" (or antithetical to the good if you must).
That aside, who is doing the judging with such a broad stroke? That they do so lends credence to the argument that it's "mentally cost effective" for them to do so. People "believe" what is mentally cost effective for them. Hypocracy can simply not occur to you if you have a high stake (or extremely low cost) in some aspect of your world-view.
The mechanics of denial are pretty obvious from this perspective. If I'm a gardener for instance, who might have done a crappy job on your whatever, it takes a lot more mental effort to own up to my mistake than it does to fix it. I value my time, and the effort it would take to do fix it more than I do admitting to the mistake.
Bah, tangent boy strikes again.
Regardless, it would be shallow for people to write off emotions as "bad" - but there's no negative repurcussion for doing so most of the time and if somehow you got that impression, that'll be "true" to you unless you're a really skeptical prick, it doesn't stick in your head, or circumstances evolve that motivate you to re-evaluate it.
Religions and rationalist theories have tended to assume we must control portions of ourselves with other parts of ourelves. This has ended up focusing on the emotions and people/creatures associated with strong emotions: sometimes women, darker skinned people, animals, the earth itself. All things considered non rational are the enemy even intra-psychically. This has caused a disconnect and recklessness. Unfortunately today the simply bombardment of our senses and minds via technology and media interrupts the experience of and controls the experience of emotions. Our intuition is even more cut off and controllable. (there are other trends out there, in fact large portions of Western society and renewed pagan societies are cutting through the judgements about the evil of emotions and desires and bodies). There is a connection between emotions and holistic approaches. As one beneficial example. What the linear mind can't calculate is often sensed by the emotions.
Well from this I can only say, the pendulum swings and gravity sucks it back to the middle. To me it just seems like a natural progression of thought that will swing back and forth as long as there are minds to swing it. It's sort of retarded though because it's pointless to find emotions as "good or bad" without specifying a context. Without context they can be neither.
- and sorry if I'm missing the context, it's been a while and I was too lazy to re-read more than I thought sufficed to pick the ball up and throw it back to you.