This is how I take it too. Sagan isn't saying that all human problems are insignificant or unimportant, but it's entirely true that many of the things we fight over and even kill each other over are, when put into perspective, pretty stupid. The whole point is to take a step back and carefully evaluate things as a first course of action and to try to save conflict and aggression for situations where it's meaningful and likely to make a positive impact in the bigger picture.