What's wrong with being transgender? Let me add something to this conversation other than to share the platitude that everyone should do that which makes him/her happy and we should butt out of other's lives if it's only to make them less happy. I mean if a guy is happier dressing as a woman and carving up his body to look like a woman, why should I really care? So, hear hear to that sentiment.
What I will add is that there is some value in looking into whether transsexuals become happier when they transition. My understanding of the data is that they don't. That is, if we look at transgenders as those having a mismatch between their biological sex and their mentally perceived sex, then it would make sense to correct that problem by (1) changing their bodies (2) changing their minds or (3) having them simply accept the imbalance. If we choose to change their bodies and we end up with someone with all sorts of hormonal imbalances, depression, urological problems, and social interaction problems, it is important to ask ourselves whether our proposed cure is worse than the disease. That is to say, altering a human body in all sorts of ways to make it look like you want in the mirror may not be the way to go if your objective was to reduce the depression and suicidal tendencies. Sure, you have a really interesting looking body, but does it house a happier mind?
I also want to point out that not all transsexuals were born that way. The narrative we all hear of the little boy who always wanted to wear little girls' clothes, to play little girls' games, and to kiss the little boys is the rare exception to the transgender personality. Most transgenders acted like and felt like little boys and then as men up through their 20s, 30s, and even 40s. There is a very significant difference between gay transsexuals and hetero transsexuals, with the latter being considered a fetish because they are sexually aroused at the thought of being a female. That group comprises by far the largest category of transsexual men. In fact, if one looks at the stats, the numbers of M to F and F to M transsexuals are about the same if one discounts heterosexual transsexuals from the mix. Once those are added in, the M to F tremendously outnumbers the F to M. The point here being that transexualism among men cannot just be viewed as a gender identity issue, but it also needs to be looked at as something that is sought by men for sexual arousal. And there is a very dark side to that equation as well, with the feminization process being part of a masochistic expression.
And that's what I wish to add to this discussion. The idea that transsexuals are just women in men's bodies that need to be freed by surgery isn't a terribly accurate statement. The truth is that most transsexuals are men who find sexual arousal by acting and thinking of themselves as women, and the surgery to free them to do this is far from freeing.
Let's take a second then to not just celebrate every difference, but instead to realize the human sexuality is extremely complex and often its expression is evidence of all sorts of deep seated issues. It is possible that there are some transsexuals who are perfectly normal in every way other than their anatomy, but I fear that is the exception.