That's not really what labor force participation rate measures.
For youth unemployment I think its less laziness than a lot of trades are impossible to break into if businesses are unwilling to train new people.
This was mostly in response to the second article you posted.
Either way I'm very sceptical about claims of moral decline when more tangible factors exist.
The big one is that as much as business claim their is a skill shortage very few are desperate enough yet to create their own skills.
Ex: Machine operators with 10 or more years of experience are going to dwindle in numbers if your never going to hire anyone with less experience.