A question about Parents Television Council?

How do they get two "green lights" and one "red light" to average out to an overall "red light"? Shouldn't that be a yellow light overall?

http://www.parentstv.org/ptc/shows/main.asp?shwid=2943

PS: I ask here since I'm sure this is some sort of Christian-backed group.
I wouldn't be surprised if it was Focus on the Family - they seem to give worse ratings for anything with homosexual characters or paranormal type shows (like how Medium isn't appropriate for under 18 seriously?).
 
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