That may be true but the press play off prejudices. Someone on the left doesn't suddenly turn far-right just by reading the Daily Mail. You can't remove prejudices because we all have them. So when it comes to views and stupidity it just depends on whether you're able to recognise prejudice and reason against it. For many people they can't and that isn't their fault, that doesn't make them stupid, it makes them human.
It's important to remember that the vast majority of the population doesn't watch daily rolling news and doesn't read newspapers or participate in politics at all. The greatest change over the last 10-15 years has not come from the profit making media, it now comes from uncontrolled news that we see on social media but there is very little you can do about it. Much of it isn't actually news and instead falls under the umbrella of 'free speech' which is its own pandoras box.
Personally I don't think that the so called traditional profit led media is a problem, we'll get a Labour government next year and how is that possible if everyone is so stupid and the media is so right-wing? Labour are the closest thing to the centre and that counts for something above all else. The country hasn't lurched from right to left, they're just tired. The same will happen to this geezer in Holland when they get tired of him.
The greatest threat at the moment comes from social media, that has led to increased radicalisation on both the hard left and far right. These people are rejecting democracy and instead demand a system of more radical and authoritative government that they believe can forceably implement solutions to the issues they care about.