Berries have very little sugar (~4-5% by weight) and will ferment out rapidly. Five pounds of blueberries is only a couple ounces of fructose.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk