Hell is not evil; it's a place where evil gets punished. Hell is not pleasant, appealing, or encouraging. But Hell is morally good, because a good God must punish evil.
Cheap grace replaces truth with tolerance, lowering the bar so everyone can jump over it and we can all feel good about ourselves.
I try to tell a story that's good enough to win the right to integrate eternal themes into it. If it's poorly written or comes across as a sermon, then obviously you don't reach people, because they're aware that you're imposing something on a story that isn't innate to it.