Theological reasons mostly centered on
1 Thessalonians 4:11-12 English Standard Version (ESV)
11 and to aspire to live quietly, and to mind your own affairs, and to work with your hands, as we instructed you, 12 so that you may walk properly before outsiders and be dependent on no one.
It doesn't have to be the end of the world or even a global or national (USA) level event, to be an expression of love for my family and a method of ensuring my availability to provide Christian witness and aid to those in need in the event, of a significant event. As I gradually grow the network of food stuff we source locally, I notice. . . . my fresh eggs have more colorful nutrient rich yolks, my honey drives away seasonal allergies, my breads are heartier, my beer is tastier. All is sourced between me and downtown. No need to go in to town at all if I skip the beer. Renewable, locally sourced, ecologically conscious stuff. . . . is better stewardship of God's creation
Genesis 1:28 And God blessed them. And God said to them, “Be fruitful and multiply and fill the earth and subdue it, and have dominion over the fish of the sea and over the birds of the heavens and over every living thing that moves on the earth.” 29 And God said, “Behold, I have given you every plant yielding seed that is on the face of all the earth, and every tree with seed in its fruit. You shall have them for food. 30 And to every beast of the earth and to every bird of the heavens and to everything that creeps on the earth, everything that has the breath of life, I have given every green plant for food.” And it was so. 31 And God saw everything that he had made, and behold, it was very good. And there was evening and there was morning, the sixth day.
So, if our job as humans is to have stewardship of the world God created, just being a "consumer" kinda seems like shirking the job. If I am unlike Cain & believe I am my brother's keeper, then I will find ways for us to live and work cooperatively as a community and within our environment. I am not talking about shunning technology like the Amish, but admiring their independence as a community & their ability to exist indefinitely through sustainable living & cooperation.