This is just offensive. It would be one thing if Craigslist was doing their best to satisfy their customers and they wanted to shut down others who were scraping their site and leeching off their business. However, Craigslist puts absolutely no effort into making their product usable. The continued existence of Craigslist is just a testimony to the enormous strength of network effect lock in.
So your argument is "Since they are not doing everything they can with their content, I can steal it"?
1) Padmapper shows the original craigslist page when you click through to the details page. 2) Padmapper doesn't seem to be monetizing itself in any obvious way, at least not directly through ads on content. 3) Craigslist doesn't monetize its content through ads, anyway.
Essentially all it offers is a wrapper that lowers the friction to discovery. You know, like those kids over at Google. Or Bing. Or DuckDuckGo. Are they stealing content?