Almost all sufficiently radical leftists hate cops, but where anarchists hate them for being the state's monopoly on violence, and progressive leftists hate them for being racist and classist, more authoritarian communists just hate them as servants of capitalist state and would have zero objections to them committing same atrocities in the name of proletariat dictatorship.
Very optimistic assessment, the far left had a way better public perception than far right, it's way more normalized because there's no more Soviet Union to point fingers at demonstrating the wickedness of leftism, many millenials still struggle with employment and other economic problems and thus may over time are likely to drift towards left as they fail to adapt, same with zoomers.
And you are making a mistake of assuming the extreme ideology needs absolute majority support to dominate. Bolsheviks and Nazis claimed power despite not being represented by absolute majority, few other extreme groups ever had it. They simply had enough people to attempt to seize politics by force, and majority of people went along with their rule.