For instance GMO allows food producers to cheat costumers even more. GMO is advertised with reducing the need for pesticides, when often it's just the plants then that are producing the pesticides (BT-gene). Another common application is to let products look fresh longer while they're actually not fresh.

In the end we're living in democracies and have to take the opinion of the people into consideration. When a huge majority doesn't want GMO, then we shouldn't use them.