He's a "door" opener just like retired admirals, generals, and high government officials who go to work in industry after their stint in government. Unfortunately, it's a common practice the defense industry.
Here's the pricing from a Canadian reseller. They will add about $731 for customs (if you want them to pay for you).
https://drdrone.com/collections/dji-mini-5-pro
I agree. You have to takeoff and land outside the perimeter of the campus to fly over the campus. You just can't use the pictures/videos for commercial gain. Can you publish it on YouTube? The "personal" part of their letter seems to indicate no. Personally I think you have every right to...
There is no law from bringing your drone to the US. Like in any country, you need to follow FAA rules. I think you'll need to register the drone with the FAA and probably take the TRUST test. Go to the FAA website faa.gov for the rules.
Volunteer drone operators could be force multiplier to search and rescue operations if there's a framework in which they can operate safely. It is time for first responder SAR personnel to come up with ideas in how sUAS, helicopters, and other airplanes can be integrated into the operations.