It's true, no country is fully self-sufficient in producing all the inputs for food.
The thing is, you're unlikely to be in a food, and fertilizer, and a heavy machinery, and an energy crisis all at the same time. Putin cuts off the gas? Just buy apples from Poland, etc, etc. Generally, the failure modes for trade in all of these are not correlated.
Some foodstuff that goes into animal feedstock, or into wasteful refinement processes (say, beer) can also be eaten directly.
Now, I'm not saying that the government should do nothing about food security... It should encourage domestic production.
The thing is, you're unlikely to be in a food, and fertilizer, and a heavy machinery, and an energy crisis all at the same time. Putin cuts off the gas? Just buy apples from Poland, etc, etc. Generally, the failure modes for trade in all of these are not correlated.
Some foodstuff that goes into animal feedstock, or into wasteful refinement processes (say, beer) can also be eaten directly.
Now, I'm not saying that the government should do nothing about food security... It should encourage domestic production.