I think the issue in UK is the old "boiling the frog" theory. They've gotten used to it, they've embraced it, so now they aren't particularly in a rush to throw stones at it.
But that's the population. The article already mentions why nobody in the Parliament says anything bad against it - the opposition started all of this, and the others are in power.
I do think the lack of a proper Constitution is also a major problem for UK. For example, in US, whenever someone tries to stop you from speaking, you can easily point to the 1st Amendment and say it's your damn right to say anything you want, even if it's scary law enforcement people. In UK, you don't really have anything like that, so people may "feel" something is wrong - but in comparison to what?! They haven't really put the principles on paper. It's all pretty vague and it's hard to get angry at a vague target.
Not only that, Article 10 of the European Convention on Human Rights guarentees freedom of expression, which was incorporated in the UK as part of the Human Rights Act 1998.
Learning more on the subject will help you greatly.