. JMB originally designed his full-sized service pistols to be carried Condition Two. In fact, he didn't even design a safety for them until the 1911. And the hammer spur on the original 1911 design is made for cocking the hammer while on horseback like a SAA. Condition One was used when the cavalryman has stopped firing and needs to secure his pistol while on horseback (decocking a pistol on horseback never goes well for rider or horse... 
) The safeties keep the pistol safe until the cavalryman can dismount and then decock. Condition One carry only came into vogue due to Col. Jeff Cooper. Just like carrying in Condition One, Condition Two carry requires training and practice. But it is a viable carry method.
OK, feel free to flame away.....
