One thing I do agree with - with the Terpstra 'attack', watching it again I disagree with a few things that have been said on this thread - 1) Vandenbergh didn't tow Stannard up, there was a clear gap that Stannard had to close (although I suppose it was 1 bike length less than if it was just Terpstra), and 2) I agree with Lefevere that I don't think Vandenbergh thought it was an attack at first. It looked when I was watching it - both the first and second times - like Terprstra went to attack, but didn't really have a lot of speed so for a second it just looked like he was coming over, and so Vandenbergh started to follow, and then when he realized simultaneously that it was an attack and that he had a gap on Stannard, he kept going. It was an unfortunate mistake, but as I said upthread I think it was a mistake for Terpstra to attack when Boonen was on the rivet. Boonen said as much in his interview with the 'they should have just kept working for the sprint' quote.
That's the thing - Terpstra is an opportunistic and selfish rider. When he was with Milram he was 'that guy who goes up the road and always gets caught, to the point that we roll our eyes about it', much like Voeckler circa 2006 was before he learned how to time it right or matured into a strong enough rider. Terpstra has learned how to time it right many times now (like, uh, Roubaix last year, which was perfect) but still goes when he shouldn't. This was one of those cases where he was just a bit selfish, his attack sucked enough that his teammate didn't think it was an attack, but it was enough to put Boonen irreperably in the red... basically a perfect storm of bad ideas.