Why on earth does it cause you such a problem. We're all bright enough here to mentally adjust the figures to factor in whether +1 is or is not excluded - and figures with and without +1 are freely available online for anyone who wants them.
Can you stop questioning other peoples opinions and views. You are not the opinion police. It causes me a problem too. But there are several people with differing viewpoints to me, but I never ask them why their views causes a problem.