I go for anonymous too… it’s much more freeing when most people don’t know who you are! I also stay away from mentioning work though I will sometimes write about how it’s making me feeling I feel I can do that as I never mention my employer and so my opinion cannot be linked to them. It is rare though. Mostly I keep things to myself but then that is true of me in life too!
As you say, there are some right nutters out there. And siteful teenagers with too much time on their hands….