Even if Abirami has turned for the better during the present, who can testify that evil mind won't return to it's ways if it goes unpunished?
SKPD should have several death sentances with no parole in sight for 150 years if the law were to take it's course. Not a penny that he owns is his, it is all the society's and belongs to the law. Abirami has no right to accept it. And Abirami must get some sentance as a co-conspirator.
As parents one needs to do the right thing which may not be what is convenient to the family. Otherwise the parents becomes criminal themselves.
What's charu to do? Only aid and abet the law.