Just trying to educate... Pine bark beetles attack live / stressed trees, needing moisture for the young larvae to survive to adulthood (they live just under the bark). When you hear crunching on dead pines, those are wood borers and their young feed in rotting dead wood.
As for why people clear cut like the OP saw... it's the cheapest, most cost effective way. The owners most likely don't even see the property! Once the under story begins to grow, it great habitat for so many animals and it provides cover for them too.
My degree is in forest management (Stephen F. Austin, '80) where you learn a half dozen ways to manage a forest.... with clear cutting being used 98% of the time.
Hopefully, they will replant it (but I doubt it...)