It's easy enough to interpret Peanuts as being that. But Charles Schultz was not trying to present that. He was presenting the world as it is, and how one person can still maintain his optimism in spite of all that. This is made abundantly clear in some of the other strips, like the Father's day strip where he explains to Violet that no matter what, his dad will always love him, and he doesn't care that Violet's dad can buy her all the things.

Schultz was a relatively devout Presbyterian (though still very much a free thinker and criticized the direction American Christianity was going and its attitude about the various wars during the 60s-80s). He was incredibly optimistic about humanity, but he showed in Peanuts the reality of our "default" state, especially among kids.

Keep in mind that these are all 2nd and 3rd graders in the story.