Earlier quoted context omitted.
I think you're thinking about this wrong. It's not "right because its justified" it's excusable because it's minor in the scheme of things. Imagine everyone is working really long hours for a couple of weeks to get something important done. You don't make it to the gym, miss a yoga class, get less sleep etc., eat junk food and get irritable. You're unpleasant and insulting to some people for a few days. Is that good?…
That's an interesting and objective viewpoint, and I understand completely where you're coming from. Personally, my sole objection is that they knowingly violated the law for personal gain. Is that excusable? Pragmatically, yes, but only because we tolerate it. I would hate to live in that kind of world (even though we do), so I speak out against this behavior.
Interestingly, you can hold this position and still speak out against it. Stretching my analogy: If Joanne is being a bitch and you don't know her well you can talk about her behind her back. If you're usually cool you can tell her to get her cranky ass to yoga and watch the fucking lip.
It's not that it isn't wrong or bad. It's just a question of thinking about it socially (the way people, though not necessarily the people of this site, are built to operate) rather than judicially/bureaucratically. Socially we take into account grey area, degrees, mitigating circumstances, and sometimes the voluptuousness of Joanne's buxom. We don't even have to be 100% consistent.
We the people (HN readers, Airbnb sleepers, etc) are not Interpol, we are humans. We don't always have to be completely objective and consistent when deciding how to feel about something. People on this site are smart, but I do have a lot of forehead smack moments when being people becomes such a struggle for some.