I have recently decided to jump on the vegeterian ship for a simple argument: humans mostly have developed to a level where they can meet all their nutritional needs without having to kill animals and cause pain and suffering for them, and I'm one of the lucky people who can afford to avoid that. Unless you're living in the poles or some indigenous community or in a prison, you can afford to avoid killing and causing suffering for other animals too.
when I hear ignorant comments from users like stevie65 about how vegetarians smell and should be enslaved etc. I just see why some people need to raise their levels of empathy, not only with other animals but apparently with other humans as well.
It's simple. Humans cause too much suffering for all the animals that they eat, and if they have the opportunity to avoid that and still be able to healthily feed themselves, then they should. It's just a matter of ethics and reason.
You should read that article that TheGrobe provided a link for.
If you want to live, you can't avoid killing things.
Force people? Nope. I'm in favour of people having the right to choose.