I remember my daughter asking me when she was a child, "Dad, why is the day that Jesus died called 'Good' Friday? What's so 'Good' about the day Jesus died?"
From what I've research (and I may be wrong), today is traditionally known as Good Friday due to the sacrifice that Christ paid to open the Gates of Salvation to us all.
Prior to, no one attained Salvation.
That's why Jesus knowingly and willingly took the sins of all Mankind upon Himself as the ultimate expiation of sin.
How easy it would have been for Christ to simply wave His hand and tell us all that that all sin, past present and to come, had been forgiven.
No... it took a blood sacrifice to even give us the chance for redemption.
And it was the example of Christ that still applies to us.
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As long as human beings have the capability to commit the ultimate worldly evil, there must be the consequence for the ultimate worldly punishment.
For the good of the perpetrators own soul, he must accept the corresponding punishment for the crime committed.
That's called expiation of sin.
I believe the example of St. Dismas (The Good Thief) says much. As most of us already know, after Gesmas (the bad thief) had blasphemed Jesus, it was Dismas who rebuked him by stating;
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