That is an issue, though with that in mind one major difference between Capitalism and Socialism is that Capitalism doesn’t really care if Cops are abusive sacks of shit, so long as they keep serving the interests of Capital, on the other hand, in Socialism the whole point of the system is to best serve the interests and well being of the people in what ever capacity the current level of development of the country can provide, and so while Capitalism let’s Cops fester with power hungry racists, Socialism actively works to root out and remove corruption, finding and kicking out the power abusers.