That's crazy. I guess I can see the point, but after 9/11 they still aired 24.
You have to remember this was in 1981 and Hinkley's trial wasn't until 1982. The pilot for the show aired just twelve days before the assassination attempt and the last name was Hinkey. When the air debuted that fall, the name was changed to Hanley and then during that season, he was referred to as Mr. H. by the students or something in the background drowned out his last name when spoken.
It was only after the trial that the last name of Hinkley was used.