Biking and drinking (in excess) — probably not the world’s best combo in general, but on the bright side it is just your own life at risk, and there’s a built-in coordination challenge, so I guess it isn’t possible to get going while truly hammered!
Even if you assume the the risks outlined in your comment as relatively high likelihood (which I don't), it still makes 0 sense to think it's anywhere near as serious as driving drunk.
Should it be illegal for people to walk around drunk as well?