Editor: Re: Alan Sandborn’s appeal for civility (Mailbox, June 16), commenting on Jennifer Fumiko Cahill’s expletive-laden commentary (“It Might Be Time to Get Totally Motherfucking Unhinged,” June 2), most times, I’d agree with him. Sometimes though — and the Uvalde shooting is one time — civility just doesn’t cut it.  Barry Evans, Eureka Editor: In the June 16 North Coast Journal Mailbox Alan Sanborn offers a lecture on etiquette, pointing out that the mass murder of schoolchildren is no excuse for foul language. I must have missed the alternative. Gordon Inkeles, Bayside…