Is this really the reason? I mean, they used to just bleep out the language that might offend.
Spielberg's contract w/ ABC sez there is to be no modification of the film whatsoever. Including censorship of dirty words. And frankly, it's quite clear this is not a movie for children, who are the only people I'd really worry about exposing to such language and violence. If grownups can't handle seeing grownup situations on TV, they oughta shut themselves in and never leave the house, because they certainly can't handle Real Life.
In fact, the sitcoms say much the same thing these days.
Hm. Can't recall ever hearing the F-bomb or S-bomb, or a few others, on network TV. Close, but not the actual words.
SW
It is Spielberg's work and he can command that (unless and law forbids it) but it is ironic that he manipulates his work to accommodate an anti-gun (anti-violence) agenda as in ET.