The vast majority of people enjoy each other and don't subscribe to the vitriol that comes from both sides. In that manner, the internet is a bit of an echo chamber where if you get all of your impressions of the world from it, you'd think people were constantly at each others throats.
The news is the same way, they report negativity, so it has a real tendency to make you start thinking of the world in such a negative way.
That's not to say there aren't real threats out there, but the vast majority of people are just trying to get through their day.
This happens to police officers too, most of their interactions with people are negative due to the nature of their work, over time that starts being their default position towards people. I'll never forget the time I walked into a bakery and decided to get a cupcake for the police officer sitting in his car outside the shop (he was blocking the alley, unsure why). The change in his face from defensiveness to pure joy when I walked up to this vehicle was easily worth the money spent.
