I call images like "crying girl" Outrage Porn.
(Dang, after publishing my comment I ended up doing a search, I guess that's a fairly common term... oh, well...)
It's designed to make you feel outraged and offended, and it's easily as addictive as drugs, alcohol, gambling and video games...
One of the things about Outrage Porn on social media sites, is it allows people to get their dopamine fixes, for each time they receive an upvote of approval, from the desired group.
What better why to fortify Propaganda than to give the viewers fixes of dopamine?