It's simple really  

I'd rather be self righteous than fatally arrogant.

To imply that any grown adult is incapable of evaluating the weather is laughable..

Thankfully, many pilots are grown-ups and don't mind when the other adults in the room say "eh, this weather doesn't seem that great, lets not go".  Even with that, we still have morons like yourself who think they know everything, ignore the med crews concerns, fly into IMC, and kill everyone on board.

In your world, where all med crew would be ignored at all times because "the almighty pilot knows everything" I wonder how many more fatal crashes you idiots would cause each year..