Waiting long enough has yielded evidence of absence of risk.
Just like the turkey had a lot of evidence for humans being nice to him until the day before thanksgiving.
GMO has been around for ~10-20 years now.
By the standard that 20 years with a new technology should be enough to see problems with it various techonologies from lead pipes, to cigaretts to asbest, were also proven to be safe.
Without labeling of products it's also difficult to actually gather the information. I think it's a bad general argument to say that people shouldn't know whether they are ingesting X because X isn't proven to do anything yet.
lead pipes, to cigarettes to asbestos
I think I disagree on these examples. I don't know that these were all proven safe. And not for very long. Even when they were proven "safe" temporarily, there were some science or medical events that caused concern.
Basically: How does one pursue the truth when direct engagement with evidence is infeasible?
I came to this question while discussing GMO labeling. In this case I am obviously not in a position to experiment for myself, but furthermore: I do not have the time to build up the bank of background understanding to engage vigorously with the study results themselves. I can look at them with a decent secondary education's understanding of experimental method, genetics, and biology, but that is the extent of it.
In this situation I usually find myself reduced to weighing the proclamations of authorities: