People stealing content to gain serps need hunting down and forced to stop via contacting aff progs, hosts etc.
Those that just use techniques that you may not approve of should be reported to the SE’s (assuming they’re breaking the SEs T&C) and then left alone.
Google (and the other SEs) give you a free service and free traffic – you get what you pay for. If you don’t like it then pay for a better service or stop google from listing your site – don’t go crying to aff progs that someone is better at SEO than you.
These people who use these techniques will get unlisted eventualy, they’re running the risk of being blacklisted for short term gain – that’s a choice we all can make.