A little young to endorse censorship, but that's just my opinion.
The Adventures of Huckleberry Finn and The Catcher in the Rye offended too many people and were once banned. 
Do you want to erase Snoopy and Linus and Peppermint Party too?
There are lessons to be learned from Peanuts - whether it's compassion for Lucy or for Charlie, or to see how to or how not to behave. 
I seriously doubt that reading Peanuts has a significantly negative impact on the psyche of America's readers.