This is straight up bullshit opinion.
First off, the only reason Gotou is at his place: Goutou's wanting to talk to Sayu, not to get laid,the fact that the MMC just forgot to bring it up is weird, that's the first logical thing to do, if I was him I'd really want to clarify that.
Second. She says "It's normal", like wtf is "normal" in the first place? Ofc you don't normally bring stray people to your house cuz normally they don't get lost or run away from their houses, hence this is not a normal situation to begin with, why would you even approach it as if it was "normal", straight up stupidity.
Third. There was this true story about a homeless black guy that was adopted by a white faimly in America, it even had a film adaptation called "The Blind side", go watch it, it's a good film. Their reasoning for taking him into their family was "it's right to help people in need, that is what any christian would/should do", totally agree with that one.
Fourth. She doesn't even consider Sayu's opinion, like at all, as if she's just a nuisance, a bother to everyone, which is not fucking true at all.
The MMC might not be the most powerful person in the story, rather it's the exact opposite, but he's still trying to help her out. You know what's that called? Being a human, for crying out loud.
Also Gotou doesn't seem to be concerned about Sayu either, she's just trying to get rid of her, or so it seems so far. It's as if everyone doesn't give a fuck about her. May be the only people who do are the MMC and the co-worker girl.
Naturally, I agree, you wouldn't help a girl in Sayu's situation like that, but that's irrelevant as she's technically an adult, it's only up to her what to do with her life, same goes for the mmc, he chose to help her, but everyone's disregarding his resolve as if he's just an idiot, the only argument they bring up is that she's "a minor" and "you might develop feelings for her or vice versa", both are pretty stupid as the first one isn't true and the second one being their problem pnly, and no one but they has a vote in that case.
Idk, it's all going down the shitter route, it's sad to watch it become a cheap drama.
I hope I'm wrong about that, really.