Well you can "survive" without cellphones and internet too, but if they make your life better and easier then why should you just try to survive? This vitamin d debate is pointless, it's the same as vegan vs omnivores. You can debate these things forever and nothing ever changes, no matter what research or whatever says, there will always be people who are anti D or pro D. Just let people live and do their own thing. Are you so worried about your stance that you have to seek approval of your views from other people?