Overconfidence, though, can be hugely damaging. Daniel Kahneman has called it the most dangerous of all cognitive biases. The three worst decisions in the UK in the last 20 years – Blair’s war in Iraq, RBS’s takeover of ABM Amro and Cameron’s calling a Brexit referendum having created the conditions in which he might lose one – were all motivated in large part by overconfidence.

https://stumblingandmumbling.typepad.com/stumbling_and_mumbling/2019/03/matches-matter.html

Chris