The GMO issue should really be broken apart in to different parts.
-GMO because tons of Roundup® has been dumped on it ~Is Roundup® safe?
-GMO for marketing or other purposes but which could have features harmful to humans. ~How much, if any, scientific & statistically valid tests have been done?
-GMO for any reason but could have features which disrupt the current flora & fauna of their environment. ~Can a problem be observed before it is too late to correct for it?
-GMO which results in expansion and/or defense of monoculture. ~Are consumers ok with low quality food with minimal variety?
-GMO which is almost certainly owned by Monsanto ~Are we prepared to cede most of the benefits (and control; cf terminator seeds) of GMOs to a ruthless, aloof megacorp?
-GMO because tons of Roundup® has been dumped on it ~Is Roundup® safe?
-GMO for marketing or other purposes but which could have features harmful to humans. ~How much, if any, scientific & statistically valid tests have been done?
-GMO for any reason but could have features which disrupt the current flora & fauna of their environment. ~Can a problem be observed before it is too late to correct for it?
-GMO which results in expansion and/or defense of monoculture. ~Are consumers ok with low quality food with minimal variety?