In my original post I made it very clear that it's something I did as a user and don't do as a mod, so my ability to press the ban button has nothing to do with this. But while we're at it, do you think we ban everyone who is a bad poster? We'd have a lot fewer posters. It's a triage thing. We ban posters who are not merely bad, but who do things that actively interfere with others. There's a lot of passive low-quality posting that we don't have the time or desire to moderate, and that's pretty much an inevitable fact of a large forum.
I think it's because your original post says "because" instead of "before". I guess it can be confusing for some people.