Everyone can be vegan - just eat vegan, and maybe go further. Veganism is for everyone, in every industry, with any occupation, and situation, and any levels of awareness or ethics. Calling anyone "not real vegan" - especially knowing that being vegan is not a rewarding social position - is unnecessary demanding and even intimidating fashion among vegans, detrimental to the spread of veganism, imho. I observed it for years, and never witnessed anything good or productive resulting from it.
Estimated Average Requirement (EAR) is the average daily nutrient intake level that is estimated to meet the requirements of half - 50% - of the healthy individuals in a particular life stage and gender group.
Because the needs of the other half of the population will not be met by this amount, the EAR is increased by about 20% to arrive at the RDA.
Before setting the EAR, a specific criterion of adequacy is selected, based on a careful review of the literature. When selecting the criterion, reduction of disease risk is considered along with many other health parameters.