On the one hand it's good Uber employs rapists and murderers,
If only you had the word reformed after employs I would have agreed with your obviously non-sarcastic comment. (He says sarcastically).
I do think, on a serious note, that reformed convicts should be given a second chance albeit they should be perhaps monitored closely and not allowed in a position where they could re-offend. So Uber could employ a convicted rapist who is reformed but only give them jobs for couples, male customers, etc. and not ones where they would be left driving a lone female either directly or as a result of dropping her friends off first.
Of course not being an employer they wouldn't know about any prior convictions, certainly wouldn't charge customers a premium for searches they have carried out on drivers, or be expected to screen the drivers they don't employ.