Because you get literally nothing out of trooning out. Nobody wants to be a "transgender", they *want* to be a woman. The only reason people troon out is because they get tricked by themselves and others into thinking that being a tranny is the same as being a woman. It's not. Instead of having to come to grips with the fact that their goal of becoming a woman is literally impossible, they just blame it on "teh heckin transphobes". Anyway unfulfilled desire = unhappy, and becoming a woman is a desire that will never be fulfilled, so it's not hard to figure out why they ack so often.