Luna del'Corvo

The thing about GMOs that is often obscured is that almost all of the crops we eat and have already been modified by humans and quite extensively at that: Wild bananas are green and have seeds in the them; the most common strawberries are actually a hybrid species created in the 18th century; and maize (corn) is also a hybrid species created by the Olmecs and Maya over 4000 years ago.

This process of domestication is a form of genetic modification and there's no evidence that it's actually safer that the direct genetic modification that's being used now. Most human-created or altered crops are more vulnerable to disease and insects than their wild ancestors and some of them have also had a bad impact on our environment, contributing to the loss of diversity of genetic diversity among plants and such.

The problem with most anti-GMO activists, though, is that a lot of them either don't know these facts or ignore them. They often also advocate for organic food, but overlook the fact that most organic food is not grown without pesticides; it's just grown with pesticides that are considered "natural" [1 (http://www.npr.org/sections/health-shots/2011/06/18/137249264/organic-pesticides-not-an-oxymoron), 2 (http://www.realclearscience.com/blog/2014/06/the_biggest_myth_about_organic_farming.html)]. Completely swearing off all pesticides is not necessarily the perfect solution, either, because insects in fruit and vegetables can also carry disease. Furthermore, even organic farms that use "natural" fertilizers (like compost and manure) can also create harmful run-offs that can contaminate the water supply and harm people and animals.

None of this proves that GMOs are totally safe, only that the solutions that a lot of the kneejerk anti-GMO crowd have to offer aren't as safe as they seem to think they are.