Also, as much as I hate to say this, the “they didn’t do anything wrong” argument is very weak. Scraping the site explicitly goes against Craigslist’s TOS:
Any copying, aggregation, display, distribution, performance or derivative use of craigslist or any content posted on craigslist whether done directly or through intermediaries (including but not limited to by means of spiders, robots, crawlers, scrapers, framing, iframes or RSS feeds) is prohibited.