Let's say you direct a remark to someone who said something and a third person comes on to tell you THEY didn't say it. Now that's reason number one.
Let's say you're judging a talent contest to see who gets a million dollar contract and one of the judges says, "I voted for her because she's cute," depriving the most talented one of the million dollars. That's reason number two.
Let's say a bunch of people claim a public forum topic as their own private domain and decide they prefer a group hug environment over anyone coming in and being "disagreeable. That is reason number 3 and sufficient in my mind for pouring some gin into the punch bowl.
Shall I go on or should we just leave it alone, as I tried to do some 10 hours ago, until you woke up?
Good idea....