It has practically nothing to do with "lesser/lazy/good/bad/etc" the IT support team is.
It is all about security. Security starts with the ownership of the network/infrastucture. If the owners (Library Authority in this case) decide that they will allow usb connections then they will allow it.
If the (any) network/infrastructure owners decide that they will not allow usb then they will create a policy which locks down usb and anything else they feel necessary to protect their network. This would/could also include CD drives and the locking out of webdomains of things as diverse as facebook / BBC / SkyNews / trafficnews / externalemail and even Ancestry for a number of reasons.
Some create virtual pc workstations (on a server, in a "sandbox") and when a user logs out the "whole" thing is refreshed(overwritten). Thereby giving them the capability of allowing USB stick for example, and not worrying about it, should they wish to. There are "many" other (part)solutions.
To pick on network administrators / support teams and call them "lazy/bad/unprofessional/etc" because she/he follow orders isn't right.
Ray
Soapbox now stored away behind server racks ............