Let's put both Bible versus into perspective.
In Matthew 26:52, Christ was essentially saying that anyone who takes up a weapon for vengeance will eventually die from such a hate-filled act. Or in short, "He who lives by the sword shall die by the sword."
In Luke 22:36, Christ was instructing his disciples to prepare themselves for the eventual persecution they would soon come to face. And thus, he gave them permission to buy weapons (swords) to defend themselves against the coming aggression IF they chose to do so. And as you know, none did.
LaMidRighter,
I understand what you're trying to do and can certainly empathize with your moral struggle on self defense (see his post #301), but what reference to these Bible verses goes to once again confirm is that man will use specific passages of scripture to suit their own purposes. Unless and until you place such verses in their proper context, you risk leading man down a very dark path.
My advice to you: Guard against false witness, my friend.
EDIT: Ask yourself, were the 9 victims at the AME church being persecuted for their religious belief? If your answer is NO (and if you're honest about why Dylann Roof carried out this terrible, horrific, inexcusable act then the only conclusion you can reach is NO), then it wouldn't have made sense for these church members to conceal carry in a place of worship for any reason whatsoever.