The expectation of the public is that police should prioritize deterrence and investigation of property crimes above assembling a massive show of force to deprive peaceful protesters of their 1st amendment rights to free speech, to peaceably assemble, and to petition government for redress of their grievances.
Cops that are busy kettling up protesters for later official intimidation and violence are not available to respond to crimes happening elsewhere.
Business owners are better off with insurance, alarms, and dedicated private security that won't abandon their protective duties every time they feel like pepper-spraying a liberal in the face for no apparent reason.