That's because sometimes people make completely baffling and illogical decisions
No, they make decisions which are baffling to you because you don't attempt to understand them. It wasn't a decision which can be based on 'logic' alone because some people win from the EU and some lose. What you believe is simple logic is actually you assessing the cost and benefits to yourself and deciding that it benefits you and extrapolating that therefore it should benefit everyone else too. That is not logic. Someone else in a different position can perfectly logically weigh up the costs and benefits to themselves and decide that the cost outweighs the benefits for them and vote leave. And that's fine, as long as they don't decide that their decision should be yours too and because it's not your decision isn't valid. Which is what you're doing.
See Cornwall now desperately seeking reassurances that despite voting Leave, they will still get the funding that up till now they've received from the EU
I think you're confused about the concept of 'Cornwall'. The people of Cornwall voted out. Now the Cornwall County Council is asking for reassurance about funding. They are not the same body of people. In fact, one might feel tempted to point out that it demonstrates a big disconnect between the benefits ordinary people feel from this funding in comparison to elected officials and bureaucrats.
For example someone working a zero hour seasonal contract for minimum wage might question exactly how they benefit from the EU funded Eden Project; which at £25 a pop is a general frolicking ground for middle class families. It received £26 million in EU funding yet only provides 400 jobs. So a cost of £65,000 per job on start up funding alone. Or perhaps those councillors are worried that they will lose their EU funded jollies to Brittany?
I think quite a few Cornish voters wouldn't really give a shit if that sort of funding went to the wall.
Really, rather than sneering at the Welsh and Cornish, you should be asking why, despite this funding, they feel the EU has made so little impact on the lives of ordinary people in these areas they were prepared to vote out. Surely if all these wonderful EU things were improving the lives of ordinary people so much they would have voted to stay in? The simple answer is simply that they are not benefitting them in any perceivable way.
It's just inexplicable otherwise. They can't have understood.
No, you are the one who doesn't understand and doesn't want to. It's far easier for you to just dismiss people as thick rather than actually listening to them or understanding that people have different experiences from your own which can lead them to vote in a perfectly reasoned and logical manner which isn't in the same way as you.