Other things there is no such thing as a completely safe version of: Cars. Airplanes. Computers. Lamps. Electricity in general. Boats. Food. Ovens. Buildings. Knives. Trees. Swimming pools. Public transportation. Flash cameras. Paper. Other people.

Nothing is completely safe. NOTHING. However, when something is safe for the vast majority of people and there's no demonstrable correlation between using it and detrimental effects (and if there is such a correlation but the net detrimental effects are outweighed by the benefits), then it doesn't matter that it's not completely safe.