I agree that mudslinging and name-calling isn't the way to go, but I disagree that we shouldn't look at the "why"?
For the majority of people, this hasn't been about the EU (because in reality only a very few people ever gave that much thought), it's about the massive divide that has arisen in our society between rich and poor, north and south etc. People are very angry and disillusioned with Westminster politics, the "elites", immigration generally. I disagree fundamentally with nearly everything THM has ever said, ever, but I do think he's right about the fundamental anger of the "working class".
I'm of the opinion that leaving the EU won't solve those issues and will actually exacerbate them but that doesn't matter now.
If the nation generally and politicians in particular don't address the fundamental issues that have led to people being so very angry - so dealing with the WHY - then we do risk a slide into an even more divided, intolerant and unpleasant society.