Edit: I think the comparison of responsibility is appropriate here.. since a cab driver may have a minor, mentally disabled, or intoxicated individual in their care.
[In any case, this is a side point. Most places don't have severe barriers to becoming a cab driver other than limit supply of licenses. And none of that even applies to Uber since they are ignoring that system.]
In order to qualify as a licensed London taxi driver, a trainee must learn the complex and irregular layout of London's ~25,000 streets (Figure 1) within a 6-mile radius of Charing Cross train station, along with the locations of thousands of places of interest. This spatial learning is known as acquiring “the Knowledge” and typically takes between 3 and 4 years, leading to a stringent set of examinations, called “appearances,” which must be passed in order to obtain an operating license from the Public Carriage Office (PCO, the official London taxi-licensing body).
from 'Acquiring “the Knowledge” of London's Layout Drives Structural Brain Changes' - http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3268356/
There is NO way that "cab driver" is the only type of position he is capable of doing. And there are plenty of people qualified to drive a cab that are capable of doing it without raping anyone.
That isn't ruining their lives. They are free to go work elsewhere where other people's lives aren't put in their hands.
I'll be more specific. This man was accused of rape and worked as a cab driver, where other people trust their lives to him. Instead, he could work as a truck driver transporting goods.
That isn't ruining his life. Truth is, it would barely change.