Just as Sam Tyler is getting to accept that he might as well start living in 1973, the brass at ABC go and cancel the series. Who says life is fair? I’ve been critical of this series when it has deserved it, but I’ve heaped praise on it much more often. It’s definitely a show that deserved a better fate than cancellation.This week, the writers finally tie in some real history of which Sam is most likely familiar: the Ali-Norton fight and terrorist attacks by The Weather Underground. The latter is handled in a largely non-political fashion. I had feared that this would be a politically charged episode, but it really wasn’t. A series of bombings kill off Hunt’s friends. A radical female professor is a suspect, and it turn out that she is indeed guilty, but not because of any social or political …