GMOs for human consumption are not necessary. Enormous amounts of plant biomass are grown to feed livestock.
GMOs also have an issue of exposing the once very inert system to black swan events, health or environmental issues.
Similar thing happened with pesticides. Before GMOs can be used we should at least test them rigorously for a couple of generations. But yeah, that stuff did not happen with pesticides, cars or anything else that now has huge externalities.