I think its interesting that Barabbas’ name breaks down to bar, son of & abba, God. When we know that Jesus is the true Son of God the chief priests and elders saw this other man as worthy of their choice.
According to the CCC, there are the literal and spiritual senses of scripture, and the spritual are divided into allegorical, moral, and anagogical.
I hardly know anything about those senses of scripture, but it seems that Barabbas (son of the father) surely represents all of us (allegorically) as we were released from sin by Christ’s death.
When the Passion is read in churches during Holy Week, the congregation always gets to play the “crowd” and to say “crucify Him” which pointedly makes us all once again responsible for Christ’s death, generally, individually, and specifically.