It just doesn't equate with traffic offences, because it's not seen as a political matter. In fact, they're generally strict liability meaning motive isn't in question anyway.
Broad claims about DV in officers, again, don't cast into doubt an individual witness (without even going into the veracity of that number), which is a separate point from jury vetting anyway.
Again, with Google, having used a product doesn't necessarily mean bias is present as you rightly point out. Is using Google going to influence someone the same as systematic healthcare issues that are central to the motive in this case? Clearly not.
I'm not disagreeing with your sentiment. I'm just telling you for a fact that there are very good reasons why the composition of the jury is especially crucial in this particular case, for both sides. Of course that's always an issue to some extent, but the profile and nature of this case are unique. The proof of this is in the very article we're commenting on, so I'm not sure what you disagree with.
Again, not disagreeing with the sentiment, but legally he WASN'T actively killing people. Nobody was in any immediate danger. That means physically and temporally immediate. That means the defences and laws that are relevant are entirely different. That's just how it works and how the law is set up.