A thousand times this. If anyone needs any further example than reality, they should take a look at the Norway Debate of 1940 to see what the party system results in.
To set the scene, Great Britain has just seen the utter disaster of the 1940 Norwegian Campaign take place; its Prime Minister is held in contempt by almost everyone and had to sit through two days of the most well-informed and savage criticism from a sequence of MPs, some of whom held high military rank and were well aware of what state the armed forces were in. Others were themselves serving in the armed forces and almost to a man slated the way he (and the Government) were conducting the war. Most of the rest had military experience in the Great War, or had helped win that conflict in other ways, or had experience in government or the Empire. Members had more evidence and personal experience available to them than almost any other MPs have had, before or since, of how badly wrong things were going.
281 of them, a majority of 81, backed the Government.
Far be it for me to stand up for politicians, but I am a believer that our environment shapes our behaviour. Take the inherent dishonesty in politics at the moment. There was a stat the other day comparing Trump and Clinton, for instance, and it had around 35% of everything Clinton said as being untrue, with Trump up around 90%. Now put yourself in Clinton's shoes. If we assume that honesty usually sounds less appealing than lies, if she was 100% honest whilst Trump was 100% dishonest, then that's hardly a fair fight and Trump would quite probably wipe the floor with her.
Now you could say that the media have a part to play, in that in some noble tradition the journo exists to uncover the truth and so on, so they should be calling out lies and telling an honest story, but I think we can all appreciate that this is a fantasy. The reality is that we have a heavily partisan media that often helps to fan the flames of dishonesty in order to appeal to their core audience and sell more copy/ad space. They're commercial entities after all so I don't think we can rely on them to police matters.
I think we can all agree that democracy works best when voters are given honest information to work with, so do we need some kind of regulator/arbiter whose sole job is to ensure that what we are told is the truth?