That's a great point -- in addition, some facts are less consequential than others. For example, if I go around believing that the Earth is five-thousand years

That's a great point -- in addition, some facts are less consequential than others. For example, if I go around believing that the Earth is five-thousand years old, it may not affect me negatively at all (unless I'm a geologist or archeologist), in contrast to your electrical wiring fact that would have immediate effect.