43 drivers out of 45,000... hardly a big deal. PH firms in London are very poorly regulated, there must be thousands of unlicenced drivers working for low tech firms - particularly the Greek, Turkish and Pakistani firms. Did any of the 43 - only some of whom were unlicensed - rape and/or murder their clients?
Whatever way you look at it, Uber is far safer than taking your chances on the streets - particularly in Dublin where drivers' self-appointed representatives frequently complained about convicted criminals and unvetted immigrants holding taxi driving licences and have gone to court to defend convicted criminals' rights to be licensed. At least with an app the journey is monitored.