Cause and effect chain: loose lug nuts, broken bearing

Most of the techs I work with refer to a torque wrench as a torque stick even though a torque stick is like a small extension made of flex steel used with an impact wrench. As for the situation of the lug nuts coming loose I highly doubt that the vibration caused the lugs to come loose, they probably missed that wheel when tightening the lug nuts (maybe the phone rang or something).