The GM crops were tested. How much testing and study do you want? 20 years? 50 years? Why are you so focused on food? What about cell phones? Microwaves (not the kitchen appliance)? Electronics like tablets? Wireless internet signals? If you look around, you'll see people alarmingly declaring that there are cancer, reproductive, and other risks associated with some of these technologies. Should we study any new technology for 20 years to ensure its safety before we use it? Without strict long-term testing, aren't we all constant test subjects? Haven't we been constant test subjects as technology has developed?
You know what I think is bizarre? There is a scientific consensus, based on thorough research, that GM crops pose no additional health risks to people. And yet some of the same people who trump a scientific consensus in favor of global warming decry it with GM food. Am I crazy or does studying the health risks of GM food in animals--in generations of them, birth to death--seem easier than studying the Earth's climate, which is presumably substantially more difficult to experiment with? I don't know how you feel about global warming, so don't be offended if this is inapplicable to you, I'm just making a general observation. It seems like an irrational distinction.