The viewpoint of a group of individuals on an issue or problem is called: public relations propaganda public opinion glittering generalization

This is called public opinion.

Public relations is how companies and organisations manage the information people have about them

Propaganda is how people influence opinions with information

glittering (?) would be make something appear better than it is (cover with glitter, metaphorically,

Generalization is making more general statements based on particular instances

This sentence is true.