Are USB mice dangerous?

I was surprised when I connected my USB mice to my laptop and it connected to dom0. I had thought that the USB mice would be connected to sys-usb.
Isn’t this a danger to dom0?

Yes, to some degree: Device handling security | Qubes OS

However it’s not very convenient to control your system without a mouse. Depending on your threat model, you can only use the trackpad.

Did you, by any chance, select the installation option that passes your mouse through to dom0?

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