Using the 'stick' is a lot harder than using the 'carrot'. I always lean more towards forgiveness even when the stick is absolutely justified. I threatened to boot a total of 3 people across 2 leaders, and never ended up having to follow through because the person in question deleted, or shaped up.

At the end of the day it is just a game, and punitive measures (even in game) ruin funsticks too. Its really hard to to pull the trigger on the boot without 100% justification.