Knowledge is the means of honor, prosperity, joy, gladness, happiness and exaltation .-- Tablet of Tajalliyat.
Treatment of Criminals In a talk on the right method of treating criminals, 'Abdu'l-Baha spoke as follows:-- ...

the most essential thing is that the people must be educated in such a way ...

that they will avoid and shrink from perpetrating crimes, so that the crime itself will appear to them as the greatest chastisement, the utmost condemnation and torment.
Therefore no crimes which require punishment will be committed....
...

if someone oppresses, injures, and wrongs another, and the wronged man retaliates, this is vengeance, and is censurable.

...
If 'Amr dishonours Zaid, the latter has not the right to dishonour 'Amr; if he does so, this is vengeance, and is very reprehensible.
No, rather he must return good for evil, and not only forgive, but also, if possible, be of service to his oppressor.