There is excellent reason to be skeptical of everything here. GMOs are not special. Given that we know the worst has occurred with non-GMOs, one would expect intense skepticism of non-GMO breeding.
How much data would satisfy you?
And of course I won't claim they're the same thing. They're two different ways to the same goal, though.
How much time and data would convince you? You say you want to opt out until there is more. How much more?
IMO anti-GMO advocates should be pushing for more specific strain/cultivar labels on food, not just a useless label that says "produced with genetic engineering." Then pro-GMO, tentatively accepting, and anti-GMO groups can all be satisfied.
I think you're right that the intended purpose of generic GMO labels is to muddy the issue and spread uncertainty, which is exactly what they do. I am arguing that this strategy is counterproductive in the long-term, both to the anti-GMO cause and to society's health and informational well-being.
What they don't do is continue adding on the risks from the process of selective breeding itself. I don't expect that direct genetic engineering is clean, simple, and interaction-free. I just expect that it has a somewhat easier time targeting specific changes than barnyard breeding by light of Uranium.
That is where the disagreement lies. It is not clear to everyone that all current and future GMOs are safe. To patronize and label skeptics as unscientific is intellectually dishonest and a form of orwellian groupthink. There are plenty of people in the industry that claim that GMOs are not very well tested. There is no scientific reason to believe that a dangerous GMO could not be inadvertently created. A degenerate case would be to insert pufferfish toxin genes into a tomato. Obviously no one would do that intentionally, but a much more subtle issue could be carried over in a more seemingly benign gene transfer. To claim that we understand everything that genes do is a utter lie. They are orders of magnitude more complex than software, and yet we introduce bugs into software all the time.
There is also lot of money and political interest behind making GMO critics look bad. There is nothing unscientific about questioning the safety of a complex engineered product that we ingest. Just look at the recent Soylent fiasco, which is a much simpler to understand product than GMOs.
We are not talking about flat earth or reptilian overlords here. This is a totally legitimate thing to question, and decide to opt-out on until there is more time and data available.