Exactly. There are surely some people that will be stingy (as Mormons are humans after all) but there's a huge emphasis on being able to help out the neighbors and the unprepared in a bad situation. Depending on the area too, they even have rough distribution/response plans in place so they aren't starting from scratch during an emergency. You'll occassionaly see comments like "I'm stocked up so my family is fine while all the city people are eating each other" but (anecdatally having lived in heavily Mormom areas most of my life) the vast majority do not feel that way. Even some of the people who I've heard said that, I'd bet a huge amount they would not sit by and watch another human starve

They may begrudge the 'city people', but they probably won't begrudge their neighbors. It's also nice to have someone to help eat your disaster food :) I've done small preparations before, and you've got to cycle it out for freshness every so often[1], which means someone has to eat it... might as well be you and your neighbors. If you're in a community of like minded, well prepared neighbors, maybe you can get some variety at least.

[1] My elementary schools had a good program of bring in canned food at the start of the school year in case of emergency, have a picnic to eat it in the last month of school. I also did have a disaster can when I lived in California; I'm less prepared at the moment.