Agreed. And Batman continues to walk that thin line every time he suits up for the night.
It's also interesting how Chris Nolan takes a very different approach in setting up the dynamic between Bruce Wayne and the bats he encounters in the cave, having them instead symbolize the struggle to overcome your fears. Like you mentioned above, in Miller's Year One, the bat serves as a source of strength for Wayne. Although frightened by these creatures at one point in his life, i.e., his childhood, Wayne clearly exhibits no such apprehension for them as an adult. And consider the long-run consequences of that fateful encounter, as told in both narratives: Nolan's Wayne triumphs over his fear and eventually retires; the mainstream version of Bruce has no such fear in the first place, and continues going about his never-ending crusade for justice.