Its not a natural v/s not issue, its a new an unknown v/s old an known issue. Sure, a GMO may pop up an us think it is the same old plant, cant help that. But that does not make it ok to make a new plant that looks like the old plant an then say it is still the same when you know it is not.It may interest you to know the GMO can and does occur naturally. All of us carry a lot of junk DNA in our genome that was introduced into it over the millenia by viruses and bacteria.