I have no objection to the science of GMO. It is the business of GMO that I do not trust.
The difference between conventional hybrids and GMOs is that the the set of plants and animals that can be obtained by the former over any given time frame is a tiny subset of those that can be obtained by the latter. GMO gives food producers a great increase in power, and as a great philosopher once observed, "With great power comes great responsibility". I don't think the current food companies have the necessary responsibility.
With conventional hybrids, they are more limited in what they can do, and it can take longer to achieve a given desired organism. These limitations give us a chance to make sure that they are not misusing their power.