If the rule was you can't kill anyone 5 levels less then you, or you couldn't kill more then 10 people in a 3 hour time frame. That would be a lot easier to follow and a lot less massive jerk deletions would happen.
Ok, so using your example of killing more than 10 people in a 3 hour time frame.
Is this a rolling 3 hour window. Is this a 3 hour block that increments (12-3, 3-6, etc).
What if I kill 7 people at 12:03 and kill another 5man group when they attack me at 15:02. What if I am in a group and only get credit for killing 4 people, even though my group killed 10. What if we're in a PK battle and you kill a 10man group. What if they want to come back and try to kill you for gear. Knowing that you're not allowed to kill more than 10 in a 3 hour window, could they just attack you knowing that if they die you get punished, but if they win they get your gear also.
See how many potential questions come up around a simple statement. If the rules were going to be specific to all situations, then you'd either get: A. So many rules you'd need a lawyer to understand them all. or B. only a couple rules but they are so restrictive that you can't do anything.
This is why the rules are vague with just an underlying intent.