Single mom...? So his treatment of women probably stems from him admiring his mom as she raised him by herself. Maybe she also had to do all kinds of stuff just to feed her family.
Other than that, the penguins... Yes, the people working there work hard, but the penguins are still captives and don't have any agency. People in slaughterhouses work very hard, but the animals getting slaughtered don't have any agency. In the case of Honoka, I'm sure she works hard, but unlike the penguins and while she kinda felt like she rolled into this industry because she had to, she now chooses to continue her job, just like Yuka chose to get out of it. Let's also not forget that the owners and managers make money from girls selling themselves, and not all of them are nice like the caretakers working at the aquarium...