So customers are not raped or murdered. If you hire a ride from Joe Random taxi driver without licensing and a background check you have no assurance about the driver.
Yet there was a scandal in the UK recently when the newspapers discovered some guy had been given a taxi license despite being a convicted rapist and the licensing body knowing he was. There was another a couple of years before that about a taxi driver who'd been picking up hookers and raping them. A few months ago, there was another scandal when newspapers found some women refusing to get in taxis driven by men of a certain persuasion, because they were afraid of being raped.
So, no, that argument doesn't work, either.