We could, except that we also live in a brach where a sufficiently-powerful cosmic ray never hit (a) the Moon, (b) Jupiter, (c) Venus, (d) Mars, (e) Mercury, etcetera etcetera etcetera, and these possibilities are not eliminated by anthropic concerns.
We could, except that we also live in a brach where a sufficiently-powerful cosmic ray never hit (a) the Moon, (b) Jupiter, (c) Venus, (d) Mars, (e) Mercury, etcetera etcetera etcetera, and these possibilities are not eliminated by anthropic concerns.