Difference between Vegan and Vegetarian? A quick search

http://en.wikipedia.org/wiki/Vegetarianism
"The Vegetarian Society, founded in 1847..."


http://en.wikipedia.org/wiki/Veganism
"The Vegan Society was founded in 1944 by Donald Watson and Elsie Shrigley, in response to the broadening of the term vegetarian to include the eating of dairy products.^[11]."


The "11" note directs to:
http://www.vegansociety.com/about/history.aspx


which has as part of the text:
"The Vegan Society, the world's first, was born in November 1944 - after a lengthy gestation. As early as 1909 the ethics of consuming dairy products were hotly debated within the vegetarian movement. In August 1944, Elsie Shrigley and Donald Watson (a conscientious objector later to be acclaimed as the Vegan Society's Founder) agreed the desirability of coordinating 'non-dairy vegetarians'; despite opposition from prominent vegetarians unwilling to even consider adopting a diet free of all animal products.

In November, Donald organised a London meeting of six like-minded 'non-dairy vegetarians' at which it was decided to form a new society and adopt a new name to describe themselves - vegan derived from VEGetariAN.It was a Sunday, with sunshine, and a blue sky, an auspicious day for the birth of an idealistic new movement."


Thus, it appears that the difference between veganism and vegetarianism, at least from this quick study, is that 
vegans have angst about the ethics of any possible animal use or abuse, as since "diary products" seems to be what the issue is. Accordingly, since vegetarianism is alright with diary products (which was an issue due to the "lack of protein" question), the question then becomes more aimed at vegans:
How do you get your protein? Which is to say, how do you stay healthy; do vegetables provide all that is needed? And, if it's a lot of work to become a vegan, do you expect those who do not share your moral qualms about animal use or abuse to join you? How would this not resemble, if not in slight bit, a Christian-like cult, in regard to the morals, if you prosthelitize, because of how hard it would be to be "faithful" to the diet?


Interestingly, there are also subsets:


"There are a number of types of vegetarianism, which exclude or include various foods.

• Lacto-ovo vegetarianism includes animal products such as eggs, milk, and honey.
• Lacto vegetarianism includes milk but not eggs.
• Ovo vegetarianism includes eggs but not milk.
• Veganism excludes all animal flesh and animal products, including milk, honey, eggs.^[15]
• Raw veganism includes only fresh and uncooked fruit, nuts, seeds, and vegetables.^[16]
• Fruitarianism permits only fruit, nuts, seeds, and other plant matter that can be gathered without harming the plant.^[17]
• Su vegetarianism (such as in Buddhism), excludes all animal products as well as vegetables in the allium family (which have the characteristic aroma of onion and garlic): onion, garlic, scallions, leeks, or shallots.
• Macrobiotic diets consist mostly of whole grains and beans."