This is way too close to “if you’ve done nothing wrong, you’ve got nothing to hide” logic.
What exactly are you doing out there in the world that this is a major concern in your life?
Making terrible choices in friends, for one. Never been accused of SA, thank christ, but figured out too late that many people live in their own reality, and rewrite history once the friendship ends. Have also known people who have been in that situation, and even if no charges end up being pressed, it’s still a gut-wrenching situation to be in.
The issue of how to handle SA accusations is such a nightmare that it’s practically inevitable that we have both innocent people convicted, and guilty people acquitted at the same time. Most of the time we don’t have the kind of oversight and institutional procedure you would enjoy if accused.