The Occam argument is basically:

• Humans are made by evolution to be approximately Occamian, this implies that Occamian reasoning is a least a local maxima of reasoning ability in our universe.

• When we use our Occamian brains to consider the question of why the universe appears simple, we come up with the simple hypothesis that the universe is itself simple.

• Describing the universe with maths works better than heroic epics or supernatural myths, as a matter of practical applicability and prediction power.

• The mathematically best method of measuring simplicity is provably the one used in Solomonoff Induction/Kolmogorov complexity.

• Quantum Mechanics and -Cosmology is one of the simplest explanations ever for the universe as we observe it.

The argument is sound, but the people are crazy. That doesn't make the argument unsound.