By mistake, twice. They were here
I was mostly curious about people who login anonymously because they don't want to be associated with their words. It must be a strange feeling to believe in something strongly enough to say it, but not strongly enough to "take credit" for it.
And it's true that you can't predict how people will react to what you've written. One thing Perlmonks has taught me is to pause and consider carefully before writing the first thing that comes to mind, especially in response to something that at first glance appears inflammatory or provoking. When I'm not sure how to respond to something, I often find it wisest to say nothing at all.