If someone is out to kill you, you almost certainly got yourself into that mess. If all they want is your stuff, give them your stuff. Do you really want to live with yourself after you killed someone that was only desperate for your plasma screen or whatever? If yes, you're the type of scary person that should not own a gun.
Cost of your liberties? Equality of citizenry? I fail to see how having a gun is necessary for, or has any relevancy to any of that. And after how the citizens of this country have proven ourselves reckless with this PRIVILEGE, handed down to us from a day when people needed to hunt to survive, that it be revoked.
Mentioning the president being defended by special agents as a defense for civilian gun rights is total hogwash, like every defense for civilian guns rights ever. The likelihood for such a controversial, black president getting assassinated is very high and it is necessary, don't be so thick.