In ancient literature, heroes were usually described as males who sacrificed themselves for the benefit of others. They also held certain characteristic such as can be seen through the chivalric code. They were expected to do great deeds of glory to even be counted as a hero in their society. This is why literature such as King Arthur were so popular in their times.
Although heroism in modern can still be represented through the lens of a superhero or war hero, it is generally given a lot more lax, and usually a lot easier to obtain. Unlike in the times of the knights, most people aren't expected to slay dragons, or rescue a damsel in distress. The theme of the "everyday hero" is certainly a huge difference between the two. In modern film, heroes are usually portrayed as the average Joe, sort of character, with flaws and vices just like anyone else. Heroes are now seen as obtainable characters with decent stances of virtue.
Ethos is using credibility to persuade someone like using a celebrity or scientist.
Pathos is using material that produces strong emotions one way or the other
Logos is using statistics and facts to persuade one way or the other.
Propaganda uses at least one or all three of these. It is material used to promote a political side, event, or point of view.
A. He hopes that the president will take immediate action to curb segregation laws at the federal level.
Hope this helps :)