User blog comment:Brandon Rhea/Bringing down the banhammer: Best practices for blocking/@comment-4578246-20120315210439/@comment-20644-20120316053531

I agree, it is hard to make the judgment. That's really where the assumption part of assume good faith comes in. It saves you from having to spend time trying to figure things out for each person, because, unless they clearly give you reasons not to, you'll just assume that they're acting in good faith.