Iraq and the bank bailouts followed by absolutely no reform are two massive ones, but there had also been a death by a thousand cuts. I've lost track for example of how many nutritional recommendations have later been retracted. Those are small but they add up. Each time it's another reason to take official pronouncements with a grain of salt.

To this I would add a profound economic hollowing out. That always boosts distrust and brings out racism and xenophobia.