Why do you think the Supreme Court has upheld restrictions on free speech under some circumstances, but overturned restrictions and others? (this is a "what do you think?" question asked at the end of a passage about the Tinker v. De Moines case, if more information is needed to help answer the question please lmk)

Amember of congress who wants to act on what the majority of his or her constituency thinks on a particular issue would be advised to respond to which of the following indicators? a. letters from constituents b. the editorial positions of newspapers in the constituency c. public demonstrations by constituents d. a poll based on a random sample of constituents e. the number of yard signs on major streets