Several cases of assault by drivers and even a rape in india are documented occurances in the Uber ecosystem that seem to be shrugged off by the company as "isolated incidents."
In fairness, they are pretty isolated. How many Uber rides have you read about where nothing happened? One of my friends here was getting a ride and she asked her driver how her experiences have been . She once got a passenger who had her go out to an isolated area then tried to drag her out of her car and into hell, but she was able to escape (and continued driving, actually). What you're describing, people being violent towards each other, is not something unique to Uber. Believe it or not, but assaults and rapes have actually been occurring since before Uber was a thing. The fact that they still occur doesn't mean that Uber failed, it means that we still have sociopaths among us who are willing to victimize other people. And it's not as if drivers attacking passengers are limited to Uber.
But, in the case of the Uber drivers attacking people, or in the cases where passengers attack the drivers, with Uber at least you know exactly who your attacker was (unless they stole someone's phone or carjacked someones car and decided to turn on Uber) which is going to lead to an arrest, but even without violent crime or the police getting involved the rating system should (in theory) remove the abusers from the system. I don't see any flamebait or troll comments on Slashdot, for example, but that's not because they aren't here. I just have my settings configured so that the system doesn't even show me them.
In Uber, there is no palpable consequence for driving a family of 4 to a corn field instead of Disney land because once hes finished his negative review of you, you're now stranded somewhere without a taxi and locked out of uber.
A single negative review doesn't lock you out of anything. But, even so, let me know when you come across a story of an Uber driver abandoning a family of 4 in a corn field.