They are not destroying the server by punishing the ones who don't follow the rules.
No DB people on foot And Dont abuse your water canon
WTF is these reasons?
Imagine one person in a car, and you on foot, drive-bying you with a deagle, which means 7 deagle shots in 1-1.5 second. You wouldn't like it.
Imagine you in a corner (or even not), and one guy throwing water on you all the time and you can't get up. You wouldn't like it.
Rules are too simple, and they're made so EVERYONE can fairly have the same ammount of fun, and others can't take advantage over them by doing several things. Those "several things" are secured with /rules. read!