This seems to me a profound teaching about the Divine Mercy, the mercy that confounds and reverses every human expectation; as the Elizabethan geographer William Camden is supposed to have written:
Betwixt the stirrup and the ground,
Mercy I ask'd; mercy I found.
It's probably safe to speculate that some of the saints of the Gospels -- Dismas, Paul, the Magdalene -- were, in their lives before their conversions, capable of evils as great or greater than those we decry in our contemporaries. It's therefore also safe to assume that God's great mercy is available to any and all of us, no matter who we may be or what we may have done, and at all times.
St. Dismas, pray for us.
(Cross-posted at Vox Nova)