It was a perfect storm, which no one really saw coming in the mainstream. We might disagree on what we have done since, but hopefully, we can agree on that!
I don't know that anyone wanted to see it coming really. It was a bubble, and there have certainly been plenty of those over the years to advise us on the herd like mentality that emerges within the bubble.
We got rich on a booming property market, the banks got rich by packing up money in new ways, the state gained enormously by both. Heck, to a large extent the state are doing exactly the same now in response to the credit crunch. The whole process of quantitative easing is designed to promote lending, and has primarily boosted the value of assets. It's certainly not shifted productivity.
Ironically, that has merely entrenched inequality by further helping those with assets already to get wealthier. Has there been any politician speaking out against QE? Certainly not from the left, and indeed we only have to look at Greece to see how many are clamouring for more of it and poo poohing the Germans for wanting to spend only what they have.
The very notion of recovering from a crunch caused by excessive lending by promoting cheap credit and deterring people from saving isn't a very good reflection of the economics of today.