I don't know how to respond to this because the airlines, including United, have always been very conservative with carte blanche censorship and editorial rights to films presented onboard. I know you'll never see a plane crash on an in flight movie so, regardless of the film being presented it was most definitely highly edited for content. I understand the people had children but if you are going to take your children out into the public you cannot expect the general public to adhere to all of the constraints a specific parent might want to impose on a 4 year old.
. . . .
I have a bit of a different take on it, actually.
Personally, I wouldn't mind if airlines eliminated the in-flight movies altogether. Most of them are horrible (at least, by the time the airlines are done butchering them), and the monitors rarely work properly, anyway (except on Jet Blue, whose system solves both the content and delivery system problems rather nicely).
I think that most adults probably feel pretty much the same way. I don't believe I've ever heard anyone raving about the in-flight movies they watched (at least on U.S. carriers). And most adults have other ways to deal with the boredom, whether it's watching something on a laptop, reading, snoozing, getting drunk, or whatever else bangs their shutters.
Soo... what purpose does the movie serve, when you think about it? I submit that unless there's movie choice (a'la Jet Blue), then the movie(s) should
all be kids' movies, specially selected for their ability to so fully and thoroughly engage the tykes that they forget all about being whiny and obnoxious.
Of course, we also have the young adults who have been so digitally hyper-stimulated for their entire lives that they consider being bored only slightly less tragic than, say, losing a limb; but in my experience, as long as
something sufficiently inane is flashing across a screen, they're usually able to fend off withdrawal long enough to finish all but the longest flights without a major depressive episode setting in.
Besides, chances are that pax in the young adult age group will have brought with them a cache of digital toys that collectively contain more computing power than existed in the entire world a few decades ago, so they should be able to amuse themselves without the airline's help.
-Rich