There's nothing wrong with not knowing.
We can't possibly know everything. But we can learn, and facing the unknown is basically what life is.
If you ask me, we fear saying, "I don't know" because we were conditioned to be afraid of that phrase, of admitting our ignorance.
But on the bleeding...
I'm an ontological naturalist, meaning, I'm inherently doubtful the supernatural even exists in the first place.
People refer to that idea as limiting, but I prefer to think of it as appreciating how precious and fleeting life is in the grand scheme of things.
If we only look at our planet...