I’m far from an expert, but Vanguard is a kernel-level program. If a kernel-level program crashed, the whole system crashes. So yes, any kernel-level program could do the same thing CrowdStrike did, intentionally or not.
Kernel-level programs can do whatever the hell they want.
Well, it depends on your definition of “best”. But if we go by total score, my “best” post is this one and my “best” comment is this one.