Its easy to choose "Stupidity" each time but I think its really a bit of 1, 2, and 3. Most players probably don't expect this level of moderation on a site that offers games so they'll find it frustrating to join. If they just spend a little time reading and observing they will figure out why the rules are the way they are. Maybe another reason is just "Patience".
There are loads of stupid people online and that's mild compared to one place I used to moderate. People would insult you to the max and demand things like they're paying you big money.