I always figured that psychiatrists aren't to be trusted anyway. These are people who have extensively studied the way peoples minds work. They are also paid for helping you through your problems.
Now it seems to me, that if they said "actually, you're mostly fine, a little odd in some ways, but pretty much everyone is, no need for therapy" they get no money for this. The best course of action for them is to plant the suggestion that you are infact, unhappy. For some people this is pretty easy to do, convincing them that they have a huge number of issues that NEED to be sorted out.
Personally, I don't like my dad very much, I try to avoid him whenever possible. This isn't really a problem, we don't even live near each other these days. However, I could spend hours in therapy to figure out WHY I don't like him, then further hours while I repair our relationship and report progress on this.
If you take your car to a mechanic, he will find SOMETHING to fix, because if he fixes something, he gets paid. You go to a psychiatrist, they will find something wrong with you. It's why fire-fighters aren't paid per fire they put out, you'd suddenly have a city plauged with fires.
If psychiatrists were paid by the hour, for being in their office, regardless of if they had a client or not. There would be alot more people just told "yeah, you're fine, no problems at all, bye bye"