Many countries, including the United States (and, individually, many of its states), are working to raise awareness of, and to prevent, parental alienation syndrome. They've designated
April 25 as the annual day to educate ourselves to prevent
this destructive behavior that some adults** choose to perpetrate against children.
Check out
A Family's Heartbreak to learn more.
**
I know of two; they are identified in earlier posts.
Here's the most hateful of the two.