Maybe this solves something I have pondered on occasionally. If we appreciate Abhidhamma, we understand that since kusala must arise accompanied by alobha and many other factors, kusala must be relatively rare, and akusala cittas much more prevalent than we would like to think especially those that might appear to be kusala but are rooted in attachment. So that being the case how is liberation possible, perhaps it has something to do with the fact that kusala, while relatively rare, is also more powerful at its best, so to speak. That might be a topic for a different forum, though. The point about wholesome cittas needing to be rooted in detachment is relevant to an Abhidhamma forum, though, and points at the relative rarity of truly kusala cittas as opposed to pleasant lobha-rooted imposters/near enemies.
Kammalakkhano , bhikkhave, bālo, kammalakkhano pandito, apadānasobhanī paññāti
(The fool is characterized by his/her actions/the wise one is characterized by his/her actions/Wisdom shines forth in behaviour.)
(AN 3.2 Lakkhana Sutta)