Lion: I want to eat you
Gnu: No
Lion: Fine, let me bite you
Gnu: No
Lion: Be reasonable, compromise with me here - let me nibble one of your legs, you have four.
Gnu: You've already eaten my cousin and sister, and I like all four of my legs just the way they are, thank you.
Lion: Being alive provides no guarantee whatsoever of a right to four legs. Your four legs make me feel unsafe, you could kick me. I insist you let me have one.
Gnu: No, I'm just fine the way I am.
Lion: You just have an all-or-nothing attitude, all I'm trying to do is be sensible here. I need to eat so I can hunt you next week.
...
As noted in other threads nearby and easily verifiable by yourself, every 20th century and later civilian disarmament (save one) has been preceded by no-negotiation registration. Since most people I speak with that advocate gun control also advocate eventual complete disarmament as the end goal, why would I believe something different would happen?
I'll spare you the anecdata, but the choice of bread and vegetables are specifically poor support structures on which to build your argument for centralization. They can (in some cases) be made more cheaply, but the quality suffers substantially.
Electricity, while lacking the strongly subjective "quality" dimensions of food, still suffers from long-range distribution. Transmission and stepping losses (as well as transit costs) are a large portion of why we don't have just one enormous generation center for the world. There's obviously a balance, but for the cost of land and the added loss of converting solar's DC to AC, local generation gets a little more advantage.