A very very important aspect of House Rules is to establish personal and intrapersonal safety. When you load the dishwasher, it is safest to point the knives downward. If you put knives in the dishwasher point-up, when someone else unloads the dishwasher they may get hurt. As part & parcel of good common sense, we think ahead to the role of cause-and-effect in our daily lives; this is part of what makes communal living possible (from roommates, dorm mates, family units and up). An important aspect of creating a more respectful and responsible community in your head is making sure that everyone is safe and that everyone consciously ensures the safety of others whenever possible.
So during your next meeting, I suggest you directly address the safety of your entire internal household -- for the safety of both guests and residents. Here are some suggestions, but always invite discussion about other possibilites:
It's a good idea to come up with 1 to 3 new rules during your next meeting to address the most important points, and add more rules addressing safety when you have subsequent meetings.