Emotions are intrinsically good and bad

[brewer]

You are describing something that works for you and explains your world but not necessarily others.

Example: A pedophile thinks about molesting a child. In his/her mind there is nothing wrong with it, therefore a positive/good thought. This leads to a good emotion (according to you). They feel love, joy and excitement. Because of these feelings they now act on this emotion to feel even better and now there is a violated child with anything but love, joy and excitement. 

According to you, do you consider this scenario objectively/intrinsically good? 

I think if you continue this discussion with myself and others you'll find that good/bad, right/wrong are subjective.

Edit: I'm not sure where you're going with the last paragraph regarding neurotransmitters. Care to expand on that also?

Edit 2: Drugs and the subsequent emotions are mostly based on set and setting.