So, what part of "Turn the other cheek" did you misunderstand?
"Jesus would not have a problem with arming ourselves against intruders, robbers, muggers, and people trespassing on our property, right?"
So, Jesus said, "Do not return evil for evil, but repay evil with good. Bless those who curse you, bless and do not curse them. You shall do good to your enemies and pray for those who persecute you." What part of that is confusing?
"We don't need to concern ourselves with what Jesus said in relation to posting armed guards at church or packing heat in the pews. After all, we need some security. We had a shooter at a church recently, and then there was Dylan Roof attacking people at a church service. We need to make sure we are a safe place for children."
Remember that other saying of Jesus, "Why do you call me …