Why liberals do not join the police

The current police discussion in the USA reminds me of the excellent book by J.Haidt "The righteous mind" discussing the inherent difference between liberal and conservative moral foundations. This difference is well experimentally described in the book but what strikes my (conservative) mind is how liberal mids can serve the army and police. The liberal mind does not like authority and loyalty - the basis of hierarchy, order, honor, and duty. The police reformation (defund) discussion does not have a significant point - liberals have to reform the police from the inside, i.e. join the police and replace the rude policemen. However, they want the dirty part of the justice work to be done by somebody else and thus denying their own conviction that nobody has to be forced to do such a job. I do understand why liberals do not have overwhelming representation in the police force, but I do not understand how they are going to resolve actual social and criminal conflicts.