The classic Scorsese movie is Taxi Driver, not Uber Driver.

I dunno, maybe it's a 20-teens thing that a wannabee Travis Bickle is now driving Uber:

The man accused of killing six people and injuring two more in a Saturday evening shooting rampage in Kalamazoo, Michigan, was an Uber driver who picked up and dropped off passengers between shootings, a source with knowledge of the investigation told CNN.

The source, who is not authorized to speak to media, said investigators believe Jason Brian Dalton was even looking for fares after the final shooting of a nearly seven-hour killing rampage.

It could be that this guy is just nuts.

It could be that Uber's abuse of its drivers drove him mad.

It could be that a he has a history of issues that would not have allowed him to get a hack license.

I'm not sure, but I saw the Scorsese reference.