How come the most self sufficient countries are absolute shitholes to live in?

The U.S. is solidly middle of the pack, achieving food self-sufficiency in four out of seven food groups. This is around the same as Canada, and double that of the UK (two groups).

Here’s its scores broken down by food group:

Fruit: 70%
Vegetables: 61%
Legumes: 1,259%
Starchy Staples: 188%
Meat: 717%
Fish: 43%
Dairy: 409%