This is an excellent, brave thing to write and I originally had a long comment highlighting a bunch of particularly poignant paragraphs that I deleted because really you should just read the entire thing. Neither I nor the vast majority of the people I know have ever been subject to online harassment and it makes me thankful that there are incredible people like Kathy out there. Lord knows I wouldn't have the courage…
How do you feel about visiting a country that allows freedom of speech and association? I don't like many of the worst of the subreddits either, but allowing them is probably much better than forbidding them for the same reason that we allow such things within the US.