Elsewhere, I brought up the issue of consent. I didn't consent to host a gamebot's traffic when I run the client, I was consenting to hosting Bitcoin's traffic. If Bitcoin traffic is now a subsidiary of SD's load, perhaps SD can be persuaded to start its own blockchain and stop taking advantage of the implied consent of others on this blockchain.
I doubt that SD can be shamed into stopping what they're doing but perhaps some users of the network can be persuaded into not giving them anymore business.
I didn't "consent to host" a pot smoker's traffic, so we should figure out a way to block Silk Road's transactions.
I didn't consent to host traffic for a site selling
adult toys, so we should block Bitcoinin.com's transactions.
I didn't consent to host traffic related to adult content, so we should block transactions from all the porn sites.
I know somebody that is a luddite, so out of deference to him we should block transactions from electronics resellers like bitcoinstore.com.
I've never used SatoshiDice, but I'm not sure I like vilifying certain types of transactions. That said, I wouldn't mind if SD could figure out a way to lower their load on the network.