Because of the internet, easy access to information, the rise of clickbait journalism, social media narcissism, and everyone's dwindling attention spans, everyone thinks they're an expert on politics and economics after reading the opening paragraphs of a couple of articles from buzzfeed/the daily beast or whatever biased news source they like most.
Add that to the fact that everyone feels obligated to be political all the time and you've got a bunch of self righteous assholes on all sides of the political spectrum sending government officials and celebrities death threats on Twitter over bills and policies that won't even noticeably impact their lives.