its as simple as this
That's complete bullshit there are tons of dudes who reason out a whole lot of shit based on their emotions.
Have you ever looked at the sheer number of men in debt.
If you get in debt(foolish kind) it's either because your stupid or being led by your emotions.
There's a hundred other things that suggest dudes don't always make the best decisions.
The generalization that men are good at decision making itself is a very emotional laden concept.
Maybe you fail to understand the question, but the simple fact that bodybuilding is dominate by insecure or narcissistic freaks proves this.