I feel being shocked at how this person was treated is not just "armchair quarterbacking". Given the power and trust we place in police, I don't feel it's unreasonable to expect they treat people with respect.
I think -- but am not certain, not being the GP -- that's their point: they don't see it happening, but think that a reasonable person would expect it.
You are correct. I meant the ellipses to indicate a continuation of the sentence, and if you put it together you get this:
"Given the power and trust we place in police, I don't feel it's unreasonable to expect they treat people with respect and that they're punished pretty severely when they betray that trust."