In all fairness I think its important to remember that correlation does not equal causation. I would argue that the attention whoring spergs that you are thinking of might not even fit the definition of transgendered. If gender is truly a psychological concept with a sociological basis and not a physical one, then a guy who gets his dick cut off for attention or acceptance or any reason other than that he's psychologically a woman, has just had a sex change. The fact that gender can't be changed is the entire reason this is an issue. You can't "decide" to change gender because its convenient. You can only change your sex, and if you are doing that in a way that is disharmonious with your gender I would argue that you do indeed have psychological issues but they are less rooted in identity and more rooted in abandonment and acceptance by society. And that a real shame, because no guy ever felt more part of mainstream society by chopping his dick off and then boasting about it on twitter. Its actually quite self destructive.
So yeah I would argue that you have problems with people who have sex changes, and that the majority of the ones who do in modern society somehow forgot that its a last resort medical intervention and not a "trendy" , "hip" thing to do.