The biggest pieces for me saying no to GMO is

A study done by a group in the UK performed the feeding GMOs to rats beyond the 3 month trial that the FDA specified. In which they found not only a LOT of cancer tumors, but a LOT of tumor.

The other piece is magnetic germination. Increase plant size, health and production without modifying anything.

CRISPR is a hatchet where a scalpel is needed. There is no guarantee that the DNA will be splice where you want, and only where you want.

Scientists don't even know what DNA does. (junk DNA??!! What an absurd name) How do they expect to modify it and know what changes they have wrought.