The scene with Barabbas and Jesus was a fulfillment of a portion of The Day of Atonement ceremony where 2 identical goats were chosen–one as the Scapegoat and one as the goat which was to be sacrificed. The goats had to be identical–thus Barabbas’ name means "son of the father’ and Jesus was the actual son of the father. The people confessed their sins and the sins were laid upon the scapegoat, thus the scapegoat became guilty of sin. The ‘guilty’ scapegoat was led into the wilderness and released, whereas the innocent goat was led away to be sacrificed.
We are all guilty of sin, so in that sense, yes, we are all Barabbas. Jesus, the innocent one, took our place and died for our sins, though he was innocent and guilty of nothing.