Setting up the perfect country... on mars? I have to disagree with you there. Free speech isn't something to be messed around with. Banning words, ideas, phrases and other verbal communication of any degree would result in a bad precedent. If for instance, someone decides that the word toast is very close to toa-ist and that it, therefore, discriminates against a culture, and by extension should be banned... I hope that got my point across, but even discriminatory words shouldn't be banned, they are vulgar and I don't condone them, but pampering an entire culture at its very rooty start, will only lead to future problems.
It's like a child, mistakes need to be made otherwise it cannot grow into a stable and long-running society. To curb subversive Ideas in this case I figure propaganda would be needed. I figure a department of population morale and happiness is something that needs to exist from the very start in order to keep the new frontier as stable and productive as possible.