Yeah, "absolutely cannot" is a strange substitute for "shouldn't" in this case. I'd further restrict it to "...in public writing that has a decent chance of gai

Yeah, "absolutely cannot" is a strange substitute for "shouldn't" in this case. I'd further restrict it to "...in public writing that has a decent chance of gaining a large audience", and possibly adding "...and which is against a party likely to notice and sue". Libel laws don't seem to deter most of the online-based libel happening all the time.