I think police robots shouldn't be.
Hard disagree, since the military will likely fight wars with either proxy wars or direct conventional wars with China or Russia or maybe Iran they will likely have lots of surplus military gear, and equipment like robots, thus they will likely want a place to either sell it or give it to police stations. (Case in point MRAPs from the middle eastern wars) You won't have a choice, they are coming.
And yes there will be pushback at first like the Xbox One being a non-disc, and hates used games video game consoles, or the NYPD doing robot dogs. But what we don't realize is that progressives, liberals, and the left don't win on everything.
Progressives/the relative left(generally Democrats) haven't won on dark money funding congress which has gotten worse, wall street regulation, the federal minimum wage, military spending, and even the top marginal tax wage which is still lower than the pre-Trump years.
Now as to why they are better than armed police officers. Because you can use unarmed robot police vs armed police officers, and thanks to the fact that the entire US has more guns than people, unarmed police aren't politically viable, and given how people have reacted to political campaigns to defund the police, I would say that assessment has been correct.