There's about as much evidence that GMOs are harmful or dangerous as there is evidence that vaccines cause autism or evidence that climate change isn't happening. Anti-GMO stances are usually poorly-informed knee-jerk responses to fear-mongering, and aren't a good look for those of us interested in ending animal suffering.
http://www.vegangmo.com/blog/vegans-must-march-for-science
(I'm totally down with hating on Monsanto; that's just healthy #anticapitalism.)