An interesting way of looking at things. I think the important question about what makes a disease is what the subjective effect of their symptoms is on their lives and those around them. This definition does inevitably involve cultural definitions of normality which are not fixed and are in constant flux. There is no simple solution though and believing that psychiatry is inherently negative is extremely simplistic.
I don't really agree with your stance but I think it is very stimulating and well written. Thanks for posting:)