Why do you trust the device you're posting this from? I presume you use it for private browsing, banking, email, and so forth.

That's not a good faith argument. A general purpose computing device is unavoidable, it's exceedingly difficult to build anything close to it. Encrypted storage is trivial without dedicated hardware, using open, validated software solutions. The CPU that software runs on gets far more scrutiny than the obscure encryption engine on the USB stick.

Even better, if bugs or backdoors are found you don't need to throw out your encrypted stick, just update the software or reencrypt.

You didn't build your computer from discrete transistors[1]?

[1]: https://www.megaprocessor.com/index.html