The fact is, only 7-10% of LDS members have a full years supply (according to church welfare dept).. If we all plan on others to share with us, it will get pretty thin..
As for me and my family I will follow the Lord and keep a years supply. I don't speculate on why or when I might need it, that's why we have a prophet.. Either I follow the Lords council or I don't. I don't believe in counciling the Lord..
It's a simple thing and the cost for a basic (grain, beans, sugar, oil, milk, salt) is $200. Thats a lot cheaper than term life insurance premiums for a year, and is the ultimate form of life insurance...
As a member of the church we have the gift of the Holy Ghost to lead us in all things..
Read the D&C 88,45, 133, and its easy to see the posible need to be self sufficient..