3.2 percent vegitarians in USA.
0.5 percent vegans.
Both are far below 10 percent.
They do claim 10 percent follow a vegitarian leaning diet. Which means they eat a modest amount of meat. As any good diet should. As I have said, too much of a good thing can be bad.
No better proof is the fact you can die drinking too much water.
http://www.vegetariantimes.com/article/vegetarianism-in-america/