Is vegetarianism bad?

http://paleodietlifestyle.com/vegetarianism-bad-environment/
This article discusses why vegetarianism is bad while I'm arguing through this blog that it is indeed healthy and helpful to the environment.
So this article states that vegetarians are disturbing the circle of life and that us as human beings have no right to do that, well I disagree with this point because humans in general do so much that we "should not" be doing, it's quite a ridiculous reason to oppose vegetarianism. This article states that eating so much soy, tofu, bread, pasta, and rice can lead to chronically high insulin levels, weight gain, and diabetes. Well now that all depends on the vegetarian's diet, for instance a person who eats meat, can get a heart disease for eating too much as opposed to someone who takes it easy and watches their intake, it all depends on the person. the last point that this article brings up is that we are cutting off the animals' food supply by growing crops where grass should be to feed these animals. Well animals can in fact eat vegetables, actually most animals that are eaten by people eat vegetables.