If you have private property, do stewardship on your piece of private property and find something new that worked better in your context then good on you. You get rewarded with some fresh clean food, or some new whiz bang (or old Russian) way to heat your home more efficient or myriad of other possibilities. And better yet if you put the info out and share it (like on permies) then the body of knowledge poor 3rd world and rich 1st world alike could benefit from gets even better. We're all in this together, but prioritizing a personal garden before commons just makes sense to me.
If some disease ravages our race again I'll be able to quarantine me and mine a little bit longer, if grand solar minimum or global warming or peak oil causes crop failures well me and mine will be eating a little bit longer. I get a 100 day drought pretty much every summer and I believe I could learn to get some plants through the 100 days with saturated woodchips and no irrigating. But I haven't achieved this yet and I don't think it's possible with plants not appropriate to my climate. So I'm going to continue trying to do my private stewardship thing, with woodchips under chickens, then composted, then mulching perennials. If I learn something really cool along the way; I am going to share it with a glad heart.