Why every utopia is a dystopia in disguise:

For a utopia to exist, it must always uphold an ideal for everyone.
To uphold such an ideal, there must be a way of enforcing it.
To do this, a totalitarian state must be established (why? Because a utopia dictates a way of life that is supposedly best for everyone; no deviance can be allowed).
There will be those that oppose this so-called ideal. In order to realize said utopia, the opposition must be suppressed.
Suppression of the opposition is oppressing the opposition.
A state where people are oppressed cannot be a utopia.

Further, in a utopian state, all ideas must be allowed to flourish. If such a flourishment is allowed, it will inevitably lead to change (in ideals). A supposedly utopian state in which its ideals are constantly subject to change is absolutely absurd.