Why? Because almost any fool can drive a car and easily judge what is and is not incompetent driving.
Very few people can fly aircraft, let alone airliners, yet they deem themselves capable of judging "competence". Farcical.
So the salaries for professional aircrew are plummeting, the T&C falling and very few people are choosing to pursue aviation as a career.
Add to this the potential for professional crews to be judged by clueless laymen as incompetent and you have the makings of the whole industry grinding to a halt for lack of anybody willing to subject themselves to such stupidity. Lets just add some money-grubbing lawyers into the equation to really accelerate this stupidity eh!