Afflictive Emotions like Lust and Emotions are not part of the normal state of mind. All the faulty states of mind are mistaken at their root. But the non afflictive emotions are not mistakes and operate even when there is no mistaken belief in the independent existence.
Positive emotions like Love and Compassion need no assistance to survive in our mind despite the ignorance which misconceives objects as existing in and of themselves whereas non virtuous attitudes such as hatred, pride and so forth are generated only with the assistance and support of ignorance. Without the misunderstanding of the nature of things, there is no way that lust and hatred can operate.
Good emotions draw favorable things to us, but bad emotions brings disaster as it operates under the misconception of things. It also makes us prejudiced towards the thing/ object or person we desire. Even slightest interference towards this can bring emotions like anger.
Similarly hatred is mistaken to be integral to the mind, it is not, it is an attitude without valid support. Compassion on the other hand is founded in truth. When over a long period of time an attitude that has a valid foundation competes with the one that does not, the one with valid foundation will overwhelm the other. This is why when you become accustomed to correct attitudes through practice faulty attitudes will finally diminish until finally they are extinguished.