I don't think you even have to argue that the lockdown "worked" in that sense. Who cares if it didn't "work"? Even aside from that, it reduced the probability of all sorts of unforeseen complications that would have made things worse for everyone. I think the burden here lies on the people who infer "the lockdown didn't immediately and directly cause the apprehension of the person, therefore it was an unspeakable tragedy against our liberties".