
Why would he check the butt tho (⊙…⊙ )

That's not about being creep or perverted.
It's about using your authority and power to humiliate others, specifically prisoners. It's especially true in authoritian goverments against political prisoners, who basically have no human rights. When we talk about torture, that's one of the ways to do it, especially when women are involved.
It wasn't the author's intention and it was used for titillation in here, but ya know.
Why are all the characters hot af ε=ε=(ノ≧∇≦)ノ