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Sure. There could be a racist judge, corrupt cop, or absurd law oppressing people in any government system ever. But that does not meet the bar required justify totally "tearing society down and rebuilding everything from scratch" as a Marxist might suggest.
There is no evidence that any alternative system would be better. There is much evidence that alternative systems end up worse. Why not fix problems where you find them instead of throwing the baby away with the bathwater?