Defund the police does have a certain legitimate point in the US, where police are basically the catch all for dealing with any kind of social problem. (In fact I think if it were phrased differently, most cops would rather there be another type of department that responded to sticky social situations).

But yes, the overall issue is really a lack of law and order in the law enforcement ranks, which decreases the public trust and increases adversarialism. The average person seeing a cop and reflexively thinking how to avoid getting their attention and avoid getting hassled for some bullshit is an indicator of a deep set problem. The cancer was fueled by drug criminalization and other crushing nanny statism (eg the draconian way traffic laws are enforced), but it would take a lot more than simply rolling those back to regain the public trust.