Having to explain your vote means giving up anonymity. So either we vote anonymously or not.
In the spirit of some earlier posts along similar lines, I tried explaining down votes twice. Both times I got hammered, so I no longer explain down-votes.
In the end, isn't XP a game we are all playing? I learned playing pick-up basketball games that the guys who argued calls the most had the least amount of satisfaction in the rest of their lives off the court so they had to succeed on the court. Draw your own analogies.