Because telling you why tells you that you were right to be afraid and won't make you less afraid. Nothing is gained, time is spent, and you're no less fearful. You know full well that nobody has studied any GMO across centuries.

What level of study would assuage your fears? Three human generations? Six? Ten? Do you think this standard should apply to all foods, or just GMOs?

If you're genuinely curious, you can read this - http://www.slate.com/articles/health_and_science/science/201...