Neuroscience, piracy and an existential threat to L&D

Why is learning evaluation so often a case of 'looking for clues at the scene of the crime'?

A 2.5 thousand-mile roadtrip across 7 countries, delivering humanitarian aid to Ukraine.

A 2.5 thousand-mile roadtrip across 7 countries, delivering humanitarian aid to Ukraine – with some learning chat along the way.

A 2.5 thousand-mile roadtrip across 7 countries, delivering humanitarian aid to Ukraine.