I'm really glad the conversation's turned to defence. The reason the European Union was founded was to stop the European countries fighting one another and starting world wars. It has worked.
All the economic & cultural teamwork is fantastic for everyone involved - and it is a spin-off from the core intent: a united & powerful Europe that can fend off attack and keep the peace within itself. Money and diplomacy are also weapons.
Food security's a crucial part of any defence strategy. Look at how many wars in the past were won simply by cutting off an enemy's food supply. Look at how the Germans laid waste to Russian land as they passed through, to make their enemy weak. There are parts of England that are still infertile, hundreds of years after the soil was salted to subdue (starve to death) an uprising.
If you can't imagine food insecurity or how quickly it takes hold, go and look at some news clips from Venezuela this month. The whole point of the common agricultural policy is that it creates a vast farming co-operative, featuring all types of terrain, climate and skills. It's really carefully balanced (following some cock-ups 40 years ago) to ensure that all the food's available to all the people.
The UK doesn't have the capacity for food sufficiency, nor the climate.
Environment is now an essential part of defence strategy because of the way it feeds into food & economic strength.
Military strength itself is supposed to be co-ordinated and balanced throughout the EU, in a similar way. It isn't quite, because of individual nations needing to think about what happens if internal fighting breaks out after all, but it does exist. I'd rather be on the big guy's team than outside on my own.
Tbh I would put up with a great deal more bureaucracy if it were necessary to maintain such a powerful and carefully balanced co-operative. Still can't quite believe we're quitting.
I do, though, understand how very far from everyday life these concerns can seem. That's complacency - these concerns underpin everyone's life, whether they're currently living in peace or at war. Those bureaucrats, for all their many faults, never forget it.