That last episode - aptly titled "First Blood" - raised a lot of interesting, moral questions.... in the past, the Waterfords were aggressively shouted down at college campuses and eventually someone tried to assassinate Serena Joy. At some later point the Waterfords helped overthrow the government, instituted a totalitarian dictatorship, and Fred Waterford personally executed the wife of his wife's would-be assassin in revenge. Some point further down the road, the enslaved and mutilated "handmaid" Ofglen suicide-bombs a gathering of high-ranking Gileadean government officials. So... is the message here that violence begets violence?
Maybe, but there's yet a deeper layer. The issues at hand is: Did the agressive response to the Waterford's initial teachings cause them to radicalize and support the founding of totalitarian regime? Would they have chosen an entirely different path, had they been treated with respect and tolerance and heard out by their opponents? Or wouldn't that have mattered at all, since the Waterfords were already so radical that they would have eventually supported a move to full totalitarianism in any case and treating them with respect and tolerance would have made reaching that goal even easier for them? If the former is the case, Serena Joy's would-be assassin bears some responsibility for the eventual rise of Gilead. If the latter is true, the only thing which is there to bemoan is the fact that the assassin failed to kill Sereny Joy when he had the chance.
The episode doesn't provide any definite answers to these questions... it does point out a severe hypocrisy on the part of the Waterfords though. In the past, Fred Waterford was outraged that his wife's freedom of speech was stifled despite the fact that he eventually created a regime that tortures, mutilates, and executes people for trying to exercise that same right. So, maybe the real question is: Would you have supported assassinating Adolf Hitler in 1921 even if you had no knowledge of future events and if you had supported it, would that have made you as bad as Hitler?