But austerity was a UK political choice pressured by a financial crash. Not the EU.
Decades of neglecting non-metropolitan areas in the UK. Again, UK political choice.
Those bad things also weren't stopped by the presence of oxygen in the atmosphere etc... but I'm pretty sure removing it wouldn't help.
When I was a Christian my answer to that was: If there was literally zero suffering in the world and we knew we'd be totally OK no matter what, not even boredom, nobody would do anything; we literally wouldn't move.