That's true, but it's dwarfed by the amount of data representing traditional cabs. If we're not just selecting for cases involving deaths, a string of cases implicating Uber drivers in violence against passengers[0,1,2] suggests - if nothing else - that the notion that Uber/Lyft drivers are qualitatively safer than taxis is false. And in the last case, it's clear that shortcomings in a system (namely, the thoroughness of background checks Uber runs) might have prevented such a turn of events.

0: http://www.nbcbayarea.com/news/local/UberX-Driver-Accused-of...

1: http://laist.com/2015/04/10/uber_driver_attack_van_nuys.php

2: http://www.forbes.com/sites/ellenhuet/2014/06/03/uber-driver...