This is the ONLY topic that is not studied cross-culturally by psychologists. Because the other three topics vary between cultures, they are studied and compared by psychologists. By doing this, psychologists can find the most effective methods by each culture to construct a method to best solve issue within those areas. Hope this helps!
The Tinker case is an important First Amendment case because it defines a student's right to free speech in a public school setting. This ruling would have to be taken into account in any later court cases involving the rights of students in a similar situation.