We should believe MUH because it's mathematically impossible to consistently believe in anything that's not maths, because beliefs are made of maths and can't refer to things that are not maths.

It' controversial because humans are crazy, and can't ignore things genetically hard coded into their subconscious no matter how little sense it makes.

RDIT: Appears I were stupid an interpreted your question literally instead of trying to make an actual persuasive explanation.

Can't really help you with that, I absolutely suck at explain things, especially things I see as self evident. I literally can not imagine what it being any other way would even mean, so I can't explain how to get from there to here.