I agree all humans are fallible. But when a person makes a mistake, why look to blame something or someone else instead of saying to ones self 'I made a mistake there that I probably shouldn't have. Maybe I will be more careful in the future?'
I may not notice any cost at all, but there really is absolutely no need for something where only 0.000000001% of visitors fall foul. I agree with Ray. Much ado about nothing indeed.