I think that users should not be dependent on Google or any search engine for stopping unethical behavior like this. Instead, the various browser manufacturers should add invalid or unethical css logic, similar to pop-up blockers, that would display a glaring warning to unsuspecting users that stroll upon a site:

WARNING: You are attempting to access a web site that is buggy or has been purposely programmed to use SPAM exploits. It is not recommended that you view this page. Do you want to continue to the site against our recommendation or do you want to black list the site and block the content?...

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Steve Sommers (blog)
Shift4 Corporation

Creators of $$$ ON THE NET(tm) Payment Processing Services