Are some guestions that make comparison largely illogical?

When a question comes up comparing people or groups, like who drives worse, old people or Asians; who are better cooks, the French or the Italians; who can parent better, men or women; who are more intelligent, science people or faith people, isn’t pretty dumb when one will never have enough evidence to totally prove or disprove the claim? Doesn’t that make any answer pretty much speculation and conjecture? You can try to compare who drives worse out of ‘A’ and ‘Z’, but what if ‘H’ actually had more accidents but because they didn’t want to pay the deductable as a group 70% never reported the accident as oppose to 65% of group ‘Z’ that does. The only evidence you have is what was reported and the actual numbers or amounts you will never know leaves your belief inaccurate. So in the end unless it is something you can control 100% of the time and you control all the elements or conditions 100% your answer is the one you most want to believe, right?