Here is what I would do.
1) Set up some kind of document formally defining the ethical standards involved in creating an alt, prohibit all the various scam activities, the cloning, the pre-mineing etc. Sticky it and make it clear that violating these standards will have consequences.
2) Get major actors like exchanges, profitability calculators etc to agree to not adopt illegitimate coins.
3) Have a network of rapid-response pools ready to attack illegitimate coins and some means of alerting/focusing them immediately when the need arises, such as an IRC channel, an e-mail pool etc.
what happened to "freedom of speech" rule?