Consider the larger context. How many relationships in Trek Lit period
, regardless of orientation, involve tragedy and loss? Fiction is not about things going smoothly. Fiction is about crisis and conflict. It's a writer's obligation to put all
one's characters through hell. It's not any one group that's being singled out. Wally
's right that canon characters are usually protected from out-and-out death (usually), but there have been heterosexual Trek Lit couples that have been split by death, including:
Those are just off the top of my head.
And onscreen we had Worf & Jadzia.