While I don't question the validity of your observations, I'm going to come out and say this straight; I think you greatly underestimate the level of self-repression that people are capable of if they have been culturally inundated enough. Yes, it's true that we Swedes are good at speaking clearly about certain things, and yes it's true that we are polite and civil almost to a fault. But this is only made possible due to the tacit understanding among us all of what's okay to talk about, and what's okay to do in a social environment. We even had a sort of self-referentially satirical humor show called "Inte Okej" (Not OK) on TV this last summer where a Swedish comedian and director by the name of Felix Hernegren made analyses of certain social behaviors and mores over here and quite a few jabs at our commonly held perceptions. And one suspects that the only reason he got the approval for that show was due to the fact that, among other things, we're also supposed to be world champions at self-deprecation...
The sum of the thought ethos in Swedish culture, and particularly academia, as I would describe it after having suffered my years passing through the system, is something along the lines of "You can think whatever you want, so long as it's the right thing". Oh, we uphold freedom of speech, again to a fault, and strive painstakingly to present things in as non-judgmental a fashion as we can. In public conversation, in the workplace, in media. But then again, that says nothing about what we choose to talk about, or connected to what topic. It says nothing about subtext or insinuation or suggestion. And both Swedish politicians and teachers and the Swedish press have over time become fantastically good at cherry picking and making their formulations very carefully. We may not allow the same level of foot-in-mouth talk and sentimentalism as for instance some American cable news channels, and have learned to restrain ourselves from e.g. hyperbole in a fantastic fashion. But even if you're not "allowed" to apply the same amount of spin, sometimes that's hardly a problem; you just have to make it more efficient.
How is this relevant, you might ask? Well, it's relevant in that it ties into the high density of political correctness that occupies this place. If there is any country that holds strongly to the naivist dogma of social constructionism and non-innateness of human traits, it's Sweden. Neither is the reason for the other, I suspect. Rather, they seem symptomatic of some more deeply rooted problem, which I suspect has its seat in the academies. And this in turn is relevant in that Swedes are traditionally "overeducated", and have been for a long time, thanks to our public education system. Which is not to say we're on average much smarter; it's just that so many of us are "intellectualized" and steeped in the theories that hold sway in academia the world over. And while they can be practically clever, most people aren't sly enough or motivated to apply even further levels of analysis or critical thinking than the tenured ones who get paid to write stuff down have already done...
I could go on to describe and delineate the problems even further, but to put it short; Tweety is right. And the reason the illusion can be maintained is because we Swedes now have doublethink in our culture. The system is self-reinforcing, applying both individually from the bottom up and politically and academically from the top down.
The sad thing is that I don't know quite what to do about it, but I suspect a good start might be forcing all Swedish teachers and students alike to read "The Blank Slate"...