Meat is not the only way to obtain protein. There are eggs, beans, nuts, etc. There are tons of nice vegiterrian/vegan recepies out there, as well as veggie-burgers (although I myself don't like them very much).
I want to go vegan because...well I'll take an example:
Let's take a chicken. When the chicken lays eggs, they are cooked and eaten. This process repeats over and over everyday. Chickens lay eggs to feed the people. Then one day, when the chicken is too old to lay anymore eggs, it is killed and eaten.
I'm not talking about people who own chickens as pets, and love them and care for them. I'm talking about the farmers who raise their chickens for their eggs & meat, and even sell/ship them.
The same thing can be said for cows, goats, & other livestock animals brought up to feed us all the time. Some vegans may feel differently about this or have other reasons for going vegan, but that is just my own belief.

IMHO