Re: What was the last movie you watched?
I think the homeschooling question is fair. It's hard to notice or be shaken by (frankly rather minimal), casual coarse language like that in Guardians of the Galaxy unless you come from a sheltered upbringing. This issue comes up on this site, unlike most filmmaking sites, because of how many conservative young people we have.
For what it's worth, I generally avoid casual use of profanity in my scripts unless it's very essential to a character, and I certainly don't think swearing is a good thing to do in one's own day-to-day life. This is mostly because of how it makes you look, though. I don't have a moral/ethical problem with a movie that has movie characters cursing in films, just as I would not have a moral problem with a movie that has a movie character doing other things I don't generally approve of, such as murder. If you're glorifying it, or marketing it to young children who don't have as great an ability to discern that can be a different matter, of course. I don't think that's really the intention with GotG, which is rated PG-13, and the characterization of Rocket and others probably would lose a lot of its edge if these murderous criminals were polite enough to avoid coarse language.
Completely agreed, Smeagol.
Though, I would say that if a writer could get away with writing such a murderous character, without out using any swearing, and still be taken seriously - that'd be a much harder feat that just throwing in some words for makeshift 'backstory' and 'character,' which I believe that the film did.