Here's what you can do. Go to supercharger.info, and then go to the Data tab. Click on the Status column to sort by Status (for some reason it doesn't work as you would expect, but it does at least move the OPEN sites to the bottom. Then you can scroll through the list of CLOSED_PERM entries, click on the "forum" link and read the forum entries that pertain to the closure. Lather, rinse, repeat until you get your fill!
Here's one that I can summarize myself:
Supercharger Proposal for NC - Warsaw, NC
This Supercharger was hosted at a disreputable hotel where the owner/manager was openly hostile to Tesla owners. So Tesla found a nearby site that was more open to drawing in customers.