I think the "Thinker" has it backwards. The "cultural trend", more accurately decline, is based on the failure to recognize that our Country is based on individual rights, not group rights. Affirmative action, the victim culture, and even the disgrace at our airports is a result of denying individuals their rights for the good of the "group".
This is wrong and anti-American.
I think he is hitting on favoritism toward a protected minority over the needs of the majority in US society.