I have learned the following from main stream media..
- It is an industry just like any other
- One goal is to sell and promote consumerism
- Another is, as you stated, to provide propaganda to the masses
- Another is to be a platform for the elite
- Most notably, this indusrty has been quite effective in teaching me to think for myself! Pretty sure this is unintentional but this is, by far, the greatest attribute of media.