I think the real question here is : Why do airlines think it is OK to use less and less experienced pilots?
For example; the sort of pilot who has no experience of "real" aircraft, say turbo prop twins, that they think it is reasonable to hold full back stick/yoke in a stall situation - and they think that by doing so they will recover and fly out of the situation? Or that it's OK to viciously 'pump' the rudder pedals through turbulence, which snaps the fin off.
What is the airline's end-game here?
In this case the Captain had over 11,000 hours, and the F/O's over 9,000 hours between them. In the case of AA 587 (which I assume you are alluding to) The F/O (PF) had around 4,500 hours including a range of twin turboprop aircraft in his previous employments, (DH6, BE99 and SH360's). The Captain had over 8,000 hours and came from a military background. He had nearly half of his experience as Captain, and had around 6,000 hours with the airline of which over 1,700 were on type.
As is evident from the last 80 years and more, experience hasn't stopped accidents. Technology hasn't stopped accidents. Training hasn't stopped accidents. It is the interaction, development, and understanding of the human factors aspects of how all these things combine together that is leading to huge improvements in safety. It is always going to be a work in progress, and (certainly in my lifetime) never likely to eliminate error or failure.
Training is now moving towards more relevant competency based and specific to the role. It still has a great deal of scope for improvement. Experience is a good thing, but it can also be the façade of bad practice, complacency," normalization of deviance," and weak training and learning.
Airlines are commercial enterprises. They want to offer a regular, safe and profitable commodity. One accident (in many cases) has the potential to kill their business as well as their customers. They don't attract customers, they have no business. They don't offer a regular and safe service, they have no business. They don't make a profit, they have no business. It is really that simple.