The drive belt that operates the power steering and alternator may slip or come off completely, resulting in hard steering and illumination of the charging system warning light. Loss of vehicle control due to hard steering or engine stall can increase the risk of a crash.
The power steering and AC belt may come off due to a damaged belt tensioner pulley. If the belt were to come off, power steering assist would be compromised.
In some cases, it may be possible to move the shifter out of park with the ignition switch off. This could cause unintended vehicle movement, increasing the risk of a crash.