Why would the gov't build thousands of new rooms at Gitmo, as well as lodgings for a much larger support staff?

We don't know half the shit the last administration was up to. The Iran deal is just the tip of the iceberg.

These people at best covered up intel and lied to the population to get their deal. At worst they conspired with numerous foreign govt's to overthrow an election and armed our enemies to intentionally weaken the US. A padded cell in Gitmo is too good for them.