Over the last year, VincentYu, gwern and others have provided many papers for the LessWrong community (87% success rate in 2012) through previous help desk threads. We originally intended to provide editing, research and general troubleshooting help, but article downloads are by far the most requested service.
If you're doing a LessWrong relevant project we want to help you. If you need help accessing a journal article or academic book chapter, we can get it for you. If you need some research or writing help, we can help there too.
Turnaround times for articles published in the last 20 years or so is usually less than a day. Older articles often take a couple days.
Please make new article requests in the comment section of this thread.
If you would like to help out with finding papers, please monitor this thread for requests. If you want to monitor via RSS like I do, many RSS readers will give you the comment feed if you give it the URL for this thread (or use this link directly).
If you have some special skills you want to volunteer, mention them in the comment section.
I hope that's the explanation and a little pushback will motivate them into scanning it.
It's worth asking if they'll scan it again, but I'm fairly confident they would continue to refuse to scan it even if there were no copyright issues. My recommendation might be asking someone else to scan the entire dissertation on their own. The catalog record indicates the dissertation has 61 pages, which is totally doable.
Incidentally, HathiTrust has it, but it's not available for download. In addition to Harvard, Cornell has a copy as well. Might be worth asking someone at Cornell if Harvard is a dead end.