Cross breeding does not induce mutations. Cross breeding mixes genetic code that already exist on the original plants.<p>Random or induced mutation like they do in GMO has lots of unintended consequences(for example radiating it). It is like a program that has not been debugged, only that a crash could be people dying or getting ill in the thousands or millions.<p>Also mixing genes from species that have nothing to do with each other like creatures that live in deep ocean that emit light with those that live on the surface will also have unintended consequences.<p>Human beings could be cocky and arrogant. I have a river near my house. Someone had the brilliant idea of introducing an alien small fish to help native fish as food. The unintended consequence was that the new small fish ate the eggs of native fish and made them disappear completely from the river.