Why the floppy disk is still used today

Last year, a broadcast of 60 Minutes surprised many viewers with the discovery that 8-inch floppy disks were still the preferred method of removable storage for the computers in a U.S. Air Force nuclear silo. The security of this outmoded technology was difficult to replicate with modern materials. "The floppy disks and associated technology are tried and true," I was told. "As you can imagine, we want to ensure the utmost in reliability and efficacy when operating such a critical weapon system. Therefore, if a system is 'old,' but still reliable, we are inclined to use it." When it comes to mission-critical hardware that literally controls a potential nuclear holocaust, "tried and true" carries more weight than "new and improved."
There are many niche reasons that an organization or an individual would continue to use floppy disks in 2015, but the audience isn't large enough to make production of new disks a winning proposition. There's a finite amount of floppy disks in the world, and that puts a limit on their usage out in the wild.
A thumb drive could easily be an input device, keylogger, etc., instead of a dumb storage device:
http://www.thice.nl/hide-your-data-in-plain-sight-usb-hardware-hiding/
http://www.irongeek.com/i.php?page=security/programmable-hid-usb-keystroke-dongle
It could cause electrical damage to connected systems:
http://kukuruku.co/hub/diy/usb-killer
It can have bad firmware that causes subtle corruption:
http://www.wired.com/2014/10/code-published-for-unfixable-usb-attack/
etc. I don't want any life-critical systems to depend on proper and careful handling a fiddly roll of paper tape. Floppies are incredibly convenient and extremely durable by comparison to paper tape. And what about very high-humidity? No, it was a happy accident that not upgrading provided some benefits, but it is a benefit just the same.