you also apparently have never witnessed the behaviour of a schizophrenic.

it wasn't premeditated. you watch the early part of the video and he just shows up, gets in his seat, and then the hamsterwheels are ticking over visibly, and then he gets out his knife.

it's not the kind of situation where you can say that he planned it in advance, it was a spur of the moment decision that he made, based on his deranged thought processes.

being that he never got locked up repeatedly for many incidents of brutal beatings of people he probably had in his calculations "they won't do anything to me, and fuck that dirty white woman"

it was random alright. very bad luck for the girl but guys like him are common in many blue cities across the USA, this is just one that got a lot of media attention for some reason.