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Well, but that's the point here. As with radiation, you simply can't eliminate it as background radiation is everywhere - it's not practically possible and it would be an utopia.
What you want is to limit exposure below a threshold where it actually can be a problem, and right now we have people living in areas with natural background radiation of ~200 mSv per year and no negative biological effects.
Same with exposure to lies - we've actually evolved with lies for ~1m years.