The leaders scoffed, "Let him save himself if he's the Messiah." The soldiers also mocked him, "If you are the King, then save yourself." Their point--since he was being crucified, then just how powerful could he be?
Allen & Williamson in Preaching the Gospel remind us that Jesus never claimed to be the Messiah or the King of the Jews. Rather, he spoke of himself as the "Son of Man" and of the kingdom of God.
But Luke's leaders and soldiers misunderstand salvation, seeing it entirely in terms of the continuation of life or military "liberation" and not as the restoration of people Israel through forgiving of sins, including the marginalized, feeding the hungry, or dying the death of a martyr, a witness, to all of these.
Those long-ago leaders and soldiers thought that anyone who couldn't stop his own death sentence must not have much power. We might ask ourselves what is proof to us of power? what goals do we think the powerful should have? And, we might also ask what salvation means to us--whether it can begin only after we die or whether it can start right here, right now.
Also we might consider what kind of people, what kind of actions that we make fun of.