How to make a safe place: 1st Realize that trouble makers are the ones making trouble. 2nd Exclude trouble makers How to not make a safe place: 1st Realize that most the trouble makers you've seen share an unchanged-able and un-related to the problem at hand characteristic. 2nd Fail to realize that this happens because most people you see in general share that characteristic. 3rd Fail to realize that many that share that characteristic are not trouble makers. 4th Exclude those who share that characteristic.