I think you meant to say "I'm
not saying" he should ignore that. But yes -- optimistic storytelling is not about pretending nothing bad exists in the world, it's about offering hope that it can be confronted and overcome. It's
when things are darkest that Superman's optimism is most needed.
In the early years, Superman confronted darkness all the time. In his first few issues, he went up against war profiteering, spousal abuse, slumlords, and the like. Of course, then WWII came along and there was plenty of darkness there. Postwar on the radio, Superman tackled racism and religious bigotry, American neo-Nazi and fascist movements, and political corruption. But that didn't make the stories depressing, because they showed that it was possible to stand up to these things and strive for something better.