Ah, yes, because those communists and feudal lords, theocratic regimes, monarchs and all manner of other non-capitalist societies have such a stellar track record of treating people well.
This isn't a capitalist or any other "ist" problem. It is a problem with society and social norms.
The cameras are there because people want them to be. The cameras get used because it is not politically toxic to do so. The use continues because the people objecting to the current abuse don't object on a principal level, they love the jackboot. They'd just rather see it used to levy ruinous fines upon middle class scofflaws (got I hate that word and the people who use it unironically) than whisk brown people off the street. Sure, different people would screech if the powers that be pivoted in that direction but at no point does the screeching add up to change because only the people who hate a specific abuse screech at any one time.