Indeed, it hasn't been an issue since the last big war in Europe and we can all see how unlikely such a thing is to happen again and that there's no need to have an insurance policy of any sort.

Where does this need for an insurance policy stops? If Europe's trade and defense agreements are insuficient, then perhaps each country should aim for a 3x overproduction, to cover those bad agricultural years? Maybe each city should too? Or perhaps each citizen, we should all retreat to rural homesteads and live on pasture-fed cow meat - a demonstrably unsustainable dystopia that will turn the entire planet into a giant ball of dung and guarantee eventual starvation for every sentient creature inhabiting it? But at least the rural voters would be among the last to die, so there's that.

Now you're just being silly.

The answer lies between your initial zero and your over dramatic 3x imaginary ball of dung.

If your government is sensible and transparent I'm sure there are public domain white papers that cover their discussions and recommendations which might make for an interesting read and put an end to this silly posturing.

>The answer lies between

Where? You are just expressing a political preference and hand-waving to unnamed experts. By all accounts, Europe is overproducing agricultural products and the large part of EU's policies are aimed at limiting this surplus.