You can always hand wave away Robocop doing something fucked up by saying it's a bug in his program.
I would agree that this would have a VERY different tone if Stryker was the character doing these brutalities (especially if he kept his attitude era "police brutality!" quips). I would be uncomfortable with that for sure.
However, I tend to think of Robocop as a tragic monster machine first and a cop a distant second. To me he never really enforced the law like a cop. He's a corporate tank dropped into urban zones designed to pacify civilian unrest. He's the friendly brand update to the machine gun blasting ED-209, a move to make deploying a war machine in US streets more palatable. He was never designed to really give a shit about law and order, which is why one of his top prime directives is to never take action against an OCP employee, regardless of any crimes they've committed. And the man trapped inside, Murphy, is in hell. There is a reason all the other test units immediately killed themselves as soon as they were activated.
Robocop blasting the shit out of a surrendering criminal would be considered a feature, not a bug by his creators. I feel like a lot of people miss the point that while we're supposed to sympathize with Murphy and it's cool when he does rad things like shooting a rapist in the dick, the OCP Robocop plan is super corrupt from the get go.