Oxygen is necessary for life. But, if we breathed 100% oxygen at normal air pressure it would destroy our bodies. Rice is eaten by many people. Yet it contains arsenic. Most grains probaby have some insect parts in them. On and on it goes......
Don't be fooled by the fools who fool themselves. They think they are so smart,
they often sound very confident, but in reality they are living breathing examples of the Dunning-Kruger Effect.
To put it more simply, they are not smart enough to know they aren't smart.
It's all too easy to fall into the Dunning-Kruger trap. I certainly have. When you crawl out of it, you have learned a valuable lesson in humility. And your smarter for the experience, IMO.