Also, this is very useful in combat situations (like in Iraq):

The armored vehicle protects you from gunfire, and with the remotely operated gun system you do not need to be outside the vehicle at the turret, and you have more accuracy and stability.
Of course, you are still vulnerable to roadside bombs and rpgs or anti-tank missiles, but I recently saw a show on the military channel about an armored car that is specifically made to withstand even those.