why his wife should be given a wrong advise that she should show mercy.
It is the mercy shown by her only which has brought her to this stage. She was nice and educated girl and got married in a poorer family (financially as well as ..............) he was dutyful (as husband confesses) only fault was her father's prosperity and this persons (apparently on instigation of ill-minder parents) demanded dowry committed violence.
she refrained from sending him to jail instantaneously and did so when compelled. He came on bail and misused his liberty by threatening violence and she was gentle enough not to request cancellation of her bail. She is lenient enough that his parents have not been arrested.
let her show some mercy only to be further tortured.
or
let her be rude. let her work hard in court and get the entire family convicted and live in their house as bonafide (out of Jail ) member of family.