Optimism can be realistic when reality contains possibilities, not just problems.

Realism is often assumed to mean focusing on problems, but a complete account of reality includes what is possible as well as what is wrong. Leaving out the possibilities is as inaccurate as leaving out the difficulties. Optimism can be the more truthful position when the pessimist has only looked at half the picture.

When someone calls a hopeful view unrealistic, ask what evidence they are using and whether it covers everything. Then check your own view the same way. Accuracy, not mood, is the standard.