Mostly because we physically can't read every comment and rely on reports.

Events like this are fairly unique.

So here's the situation:

Last night? I didn't see anything removable or bannable and went to sleep.

Waking up today, I had a butt-ton of replies to wade through, then reports, now I'm going through the whole comment tree looking for rule violations.

So far, as of your comment, it looks pretty clean! I'm impressed!