Umm rogue programs "injecting" bad drivers? There is no reason why they can't prevent programs from "injecting" drivers into the kernel. The simplest way to do that is to have real privilege separation. No what they're doing here is trying to protect users from themselves. The "abhorrent" attitude being that users are too stupid to manage their computers. That they don't deserve the right to do what they want with their computers, because if you give them that right then they will inevitably mess up their computers.
And not that having signed drivers only prevents really affects operating system stability not security. From a user perspective the security they care about is the security of their data and that can still be compromised without installing device drivers.
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