Sure: I think you're essentially missing a whole set of concerns - ones that are not purely technical - behind why this method is popular; and so your arguments wouldn't convince someone actually responsible for one of these scripts to change or cease the practice.

Nobody would argue that it's categorically safe/good/smart to blindly pipe a script into your shell; and for the record, I agree. I would also readily agree that habituating users to doing this probably creates new, more general risks especially among how less-technical users interact with their CLI.

However, the realities of the "real world" make it popular for a reason, in light of those negatives; tons of scaled projects continue to offer a 1-liner. So we have to ask, why? They'd probably say that's because it (a) improves project adoption, and (b) reduces "install broken" tickets.

You have to address the non-technical merits and goals to get behavior to change here, and sadly, I don't think anyone has done that.

But who cares about me? I'm not currently maintaining one of these (though I did once). My suggestion to bring your argument to an active project was genuine: try it! I'd be delighted to see you bring about the change you want.

[PS: The commenter I replied to originally used the term "bad faith", which they've since edited]