Strange: Slashdot seems to have eaten my original reply. C'est la vie.
No, Christ never said anything about beating swords into plowshares. That was from the Old Testament Books of Isaiah and Micah, where the authors were speaking about what life would be like once God's plans came to fruition: an end to war, no one will lift a weapon against each other, and so forth.
Christ, for his part, said he did not come to bring peace to the Earth, but instead to bring a sword (Matthew 10:34).
Further, Christ almost certainly celebrated the Jewish Feast of Purim, which celebrates the avoidance of a genocide. The evil Haman tried to organize a Go-Murder-Your-Jewish-Neighbors-And-Take-Their-Stuff Day, but Mordecai and Esther were able to persuade the King to enact a By-The-Way-The-Jews-Get-To-Carry-Swords Day. Haman's attempted genocide failed due to the Jews being armed. To this day, the Feast of Purim is one of the best celebrations in Judaism -- it's a day whereupon observant Jews believe they are commanded by God to get shitfaced drunk until they can no longer tell the name of Haman from the name of Mordecai. (It takes a lot of wine to get that far.) I have fond memories of being in college and Rabbi Avi walking across campus, waving his arms and calling out "WHO WANTS TO GET LIT FOR GOD? FREE BOOZE AT CHABAD!"
Further, Christ said quite clearly he did not come to change even one letter of the Law, but only to fulfill it. Part of the Jewish Law involves how one treats rodef -- those who seek to shed another's blood unjustly. Jewish Law says, point blank, to give them one warning to stop. If they don't, then all Jews are commanded to stop the rodef by any means necessary, even if it means bloodshed.
So if the din rodef is part of the Law, and that's part of the Law that Christ said he did not come to change but to fulfill... then yes. The only way you can get the idea Christ was a pacifist is if you decide he was lying about not changing the Law. Christ advocated the possession of arms, and the ethical use of the same.
You can rail all you want against weapons. Go ahead, doesn't matter to me a bit. But when you try to rewrite history in order to satisfy your psychological hangups, then I have to quietly insist, "no, that is not how it happened."