You are discovering what Joseph Sobran called "Alienism" - which is the preference for, protection, promulgation and promotion of any culture OTHER than one's own.
One of the features of modern leftism is the perverse rejection of U.S. culture and traditions in favor of something ANYTHING else!!
From a psychological perspective, this is linked to what (genuine) psychologists call "the psychotic response to stress". That is when a person responds to some problem or emotional crisis by resorting to some coping method that is foreign, experimental, strange, extreme, weird, radically divergent from previous-tried, reasonable methods.
For example, a normal person when confronted by say a lack of clear direction after graduating from college might take a few months off to relax and see the world before deciding on what to do with their life. Maybe one would take some time off from work or school to consult with trusted friends/counselors, relatives about their thoughts, feelings and opinions about what to do with their life. They might make plans to take incremental measures to test the waters of a lot of different careers in order to try to get a sense of what they really want to do in life. IOW, follow some reasonable rational plan which has good chance of success in ameliorating their doubts without causing severe disruption to their life.
On the other hand, a person who resorts to the psychotic response to stress might decide to drop acid, go to a bunch of rave parties, join an "artist" community living in an abandoned warehouse, sell everything they own and move to Tibet to join a Buddhist monastery. None of those actions are very rational/reasonable and are all fraught with enormous risk of disaster and severe, permanent damage to their life.
The impulse toward the deviate response to stress is also linked psychologically to what CG Jung called "the Shadow" impulse. Jung's research into the human psyche led him to form the theory that all normal minds have a sort of Shadow mind which exists just below the conscious mind.
For every conscious impulse that we follow, there exists a suppressed, semi- conscious one which derives from the Shadow. An example of a Shadow impulse would be say, driving a winding mountain road and having the odd thought come to see what it would be like to simply jerk the wheel over and drive off the cliff. Normal people find it very easy to resist that Shadow impulse, because their conscious rational impulses (to remain alive, well and pursue happiness) dominate over any such deviate inclination.
Leftists often have a perverse fascination with remaining conscious of and obeying their own Shadow impulses. Instead of cherishing and protecting normal, innocent young children, they cherish and protect adult, jaded, deeply-disturbed sexual deviates. Instead of cherishing and protecting innocent victims of violent crime, they cherish and protect those who commit horribly violent crimes. Et cetera.
Alienism with it's attendant perverse fetish for strange, experimental, foreign, anti-social, radically extreme things and behavior which come from pandering to and obeying their own Shadow impulses, can be seen in leftist behavior and policy every single minute of every single day.