It's true I have never met anyone that was extremely to the right as, say, the members of a certain subreddit, and that we do not have Fox News (and not the religious angle either) but...
I know people who vote against their own interests over and over again here too. People who'd jump in a fire for you, who'd care the now elderly violently abusive parent who threw them out at 16, who might not even be racist, or hate the poor or the Muslim or whomever the current scapegoat is... They just get stuck on ideas such as 'Left Party 1 is made of crooks' and 'Left Party 2 will never accomplish anything' and 'my vote doesn't matter anyway'. They vote right. Not for the National Front, but for tamer parties. And then they wonder why things are getting harder for them on various fronts. (Our system is thankfully geared a little differently than yours). I also know racists - you know the type: 'well I know some good Religion X/Nationality Y, it's just the other X/Y that are bad" - and I know homophobic assholes too. I've spend my life listening to them. I've sat at their tables as they described the hilarious time they beat up that gay boy who made a pass at them when they were a teenager. No country has an absolute monopoly on those.
I know some of them won't listen. I know some others who will only reconsider if their child/sibling/significant other is impacted by some issue they were firmly refusing to solve. And I know some will sit down for a rational conversation.
That teenager who beat up that gay teenager who made a pass at them grew up into a man, and that man sat down with me and let me explain to him what it felt like to be bisexual, how it wasn't a choice, and so on (yes, it was a family member). They listened and they did they best to understand, and never showed me less respect than they did before I opened up on my romantic preferences. Some people can change.
I know it's frustrating and infuriating and that the impulse to write everyone off is strong. I can't count the amount of times I nearly left slamming the door. Actually, I did that a few times...
But despite everything, and despite how difficult it is, you can't just bundle everyone into the same package and give up. Yeah, maybe a lot of people will never change their mind and will take glee in making your side suffer and who act like members of a cult, but maybe their 16 year old kid who is pretending not to listen to your arguments is paying attention. The people you might reach are not necessarily the ones waving their hatred in your face.
Yet, I can't count how many times I've seen comments on /r/politics that would belong on TD's front page. Just erase 'Trumpers' and write 'liberals' instead. This saddens me, because it silences discussion and alienates even the center-leaning people.
Now that I've rambled for pages...
I'm on this subreddit mostly because I have American friends and I'm worried for them. I talk to them every day (shit, I know more about your politics than about mine by now). I have a friend with severe mental illness who is likely to jump off the closest bridge the day she stops taking the mood stabilizers she can barely afford now (hence my interest in your healthcare). I landed here to begin with because how terrified my trans and immigrant friends from Georgia were on election night.
I also have conservative friends from staunchly conservative families who are horrified by Trump and his cronies and are praying to see them be removed from office. They wouldn't touch the most popular right wing subreddits with a fifty foot pole. Other (liberal) friends are telling me how their families - firmly republican, 'Fox news is always on at home' - are gradually dropping out of the republican party. It might not be much, it might just be a few people... But it's better than nothing, isn't it?