Because you are getting the basics of economics wrong.
You have spent many years of schooling learning to count.
Have you studied economics for at least 1 year of formal education? Have you read a book by a real economist?
Read 'Economics, the user's guide'. This is not how they think, this is not how they argue.
What we have here, is a person who hasnt learnt math arguing that 3 + 3 = 7 and claiming it's logically obvious.
Or like a medieval scientist arguing that Spontaneous Generation (Mice spawn in straw by themselves) is a law of physics and it's logically obvious.