Very rarely are drivers, including USB drivers, written to assume a hostile device (see e.g. the PS3). Frankly, they rarely seem to be written by people who care about software at all. (I still can’t get over the very first Zenbook, which suffered spontaneous deaths under Linux because the ACPI bytecode in the firmware tried to initialize a nonexistent IDE controller. And people say it’s Linux that has a hardware support problem.) So this is a somewhat valid concern.

But I still can’t get over the idea where the default configuration of BitLocker is completely useless for basically anything except working around storage devices that will lie to you and not erase things you told them to. I just refuse to accept that’s in any way sane.