Vegans, why do you put yourself through hell?

I do understand if vegans have no choice but go for non-dairy and many of the non- foods. But if you are choosing it over being a regular vegetarian, then life can get difficult. Here is one comment that I think drives home a point.

“Vegan cupcakes can have just as much far, sugar and calories as any other cupcake, They are not healthier, except perhaps that by tasting like dog food, you will eat fewer of them.”