Taxi drivers are the most aggressive, entitled and dangerous road users where I'm from. I'd gladly see driverless cars instead as I have no doubt that even in this early stage they would be better and safer than the cunts that drive taxis around here.
Some people are so obsessed with their vehicles that seeing one destroyed feels like a personal attack on their rights. Acting like a bunch of cars don't kill a bunch of human beings every day regardless of who's driving them, professing blame belongs solely to the victims for being in the wrong place and time. Then you can see how they act when roles are reversed and the idea pops into their minds that people might destroy their precious cars, instead of the norm where cars destroy human bodies. Americans particularly seem to be completely brainwashed since the reeducation campaigns of the likes of AAA a hundred years ago.
Driverless cars are cool as fuck but still need their kinks worked out. Driving sucks and so does doing it for a living, I don't see a real negative especially once the tech cements them as safer than human driven cars, or at least no real negative which doesn't have it's root in our broken economic system.
An other article explain it got stuck in the crowd and then stopped moving as it should. Embarrassing to see people cheering on mindless vandalism and sharing false info.
Edit: it doesn't seem to be very clear what happened and there's conflicting information so my last paragraph might be completely wrong and even worse, hypocritical.