I somewhat disagree with part of what you say:
“The Left says ‘defund the police’ because the Left wants to commit crimes with impunity.”
This is true at one level, because of the general immorality and perversion of the Left. But I think the upper levels, the movers and shakers, also want to dismantle society with constant lawlessness in order to get rid of the Constitution. Even what is left of it hinders them in the creation of the totalitarian State they desire.
They want repeat, violent felons released on bond to continue spending terror, for example. They don’t necessarily want to dirty their own hands or risk confronting an armed citizen themselves. Instead, they insure that the criminal underclass does their work for them.
Perhaps my statement “the Left wants to commit crimes with impunity” could be re-phrased as “the Left wants crimes to be committed with impunity.” That constant chaos opens the door for them to the create the totalitarian State they desire.