[Ghoulish Delight]

It's lumped in because it involves the same set of social rules revolving around gender identity. "You're a boy so you should want to fvck girls. You're a girl, so you shouldn't want to play with trucks." And it is met with the a similar level of ignorance and intolerance.

Not being involved myself, I can't claim to know all of the nuances, but from an external viewpoint, the difference between trans and gay doesn't seem to be a much bigger gulf than the difference between bi and gay. Especially when framed in the political terms that the "LGBT" community has been lumped together to tackle. It all boils down to, "I may have been born with X or Y equipment, but that doesn't mean I should be required to be like everyone else born with X or Y equipment just because that's how society's always been." The particulars of HOW you don't fit into the societal gender roles aren't the issue.