We use gene splicing all the time in grains that are used for food consumption.
Roundup ready corn/soybeans are resistant to round up, making it easier and cheaper to kill weeds (higher yield)
Several traits can be added to corn to make it less attractive to insects and root worms (less pesticide applications).
At the end of the day gene splicing has made food cheaper, and for the most part saved us introducing more chemicals into the environment.
It is a good thing.
Having BT genes in your food is bad news. The common gut bacteria AND your own gut cells can pick up those genetic fragments and generate pesticide in your body. You can't get rid of it once you have been contaminated. It is NOT a good thing. It kills. See BT GMO info