It was easier to fit in as a bisexual person in the past, than a homosexual person, so bisexual people didn't need as much representation in the past. Ironical

It was easier to fit in as a bisexual person in the past, than a homosexual person, so bisexual people didn't need as much representation in the past. Ironically, now we're at a point where that's flipped, and you need to be either gay or straight and can't be somewhere in the middle; but, earlier on, bisexual people could escape persecution and therefore weren't the primary focus. It's a lot more effective to have the discussion "Dad, I like guys!" and get the father to accept that in the 1950s than it was to say "Hey dad, I like guys and gals". The father could just as easily go "You know, I think there's some good looking men out there, too" and completely miss the point.