Is 2x2=7.21 an opinion or a simple absurd? I don't insist the lies I mentioned are as easy to identify. I understand they are easier for some people to believe.

Is 2x2=7.21 an opinion or a simple absurd? I don't insist the lies I mentioned are as easy to identify. I understand they are easier for some people to believe. But the nature of the difference (as compared to complex, discussable philosophical ideas like "capitalism is a problem") seems to be the same. While abstract philosophical questions of the "life, universe and everything" category can be discussed infinitely and there is no simple right answer, there also are questions to which a simple answer exists, discoverable by any person who would care to exercise some logic (preferably alone, without being afraid to loose an argument).