James R. Fitzgerald (born June 24, 1953) is an American criminal profiler, forensic linguist, and author. He is a retired FBI agent and best known for his role in the UNABOM investigation, which resulted in the arrest and conviction of Ted Kaczynski.
So Fitzgerald most likely learned to type in the 50s or 60s, long before the advent of personal computers. It's common for people who grew up writing on typewriters to feel more comfortable on them. Remember that typing is done with "muscle memory"; people who get beyond hunt-and-peck aren't consciously deciding what to do with their hands. Rather, they are relying on automatic processes. Switching to a PC, or even to a different type of typewriter, can make typing feel "off". It's a bit like someone who grew up driving cars with standard transmissions preferring to not use automatics, or a baseball player who grew up using wooden bats not wanting to use an aluminum one. There's also force of habit, and that drawbacks that you're used to (e.g. not being able to save your work) tend to seem smaller than new ones (e.g. having to wait for the computer to boot up, needing electrical power, having to deal with a printer, etc.).