loving lost my stuff
also what's the point of including lesbian if you already have gay in LGBT
it's like saying that Obama is the president of the United States and Texas
My guesses:
Because minorities can't stand being grouped into a larger group.
They like four letters.
"LGBT" is catchy.
"LBT" might make people confuse Lyndon B. Johnson (LBJ) as Lyndon B. Thompson.
Maybe the person who made it up is stupid.
Maybe the person who made it up wasn't thinking.
Maybe the person who made it up is a troll.
Maybe....uh...
I'm out of ideas.