Because Brexit is going to cost A LOT of money.
Because the economy is going to decline (and they know it).
Abd because it's not as easy as 'just going out'. There will be bills to pay, they might still have to pay something to access the single market (if we ever get there).
If you have noticed, there hasn't been ANY costing of Brexit. Plenty of talks about making it a success etc..
But no costing at all.
There is a reason for that.... (and that's apart frohe fact they don't really know where we are heading)
More importantly re the NHS, there is the fact that, regardless of Brexit, they wish to get rid of the NHS to replace it with a nice private system. Good for investors, not an issue for people who have enough money.
And more importantly it goes right into the idea that whatever happens to you is somehow your fault. You get ill, it's because you haven't eaten your 5 a day/do enough exercise etc... You struggle to pay for your care so have to do wo, it's because yo haven't been careful enough to pay for said private insurrance, income protection, life insurrance whatever it could be etc.
I don't think there is a social experiment going in there. There is a total lack of care for others nd a selfishness that goes well beying what should be acceptable IMO.
one of the big issues there isn't just all the unnecessary deaths. It's the fact that people won't be able to get treated when they need it. That means longer periods to recover or never fully recovering.
That has a cost for the economy because people won't be able to work so wontbhave money to spend. And the UK economy is based on consumer spending. When consumners stop spending, it collapses.