i would not say that slap was not intentional...yes it was done in a fit of rage but that doesn't justify it. slapping one's wife is wrong means wrong.
n yes i agree that madhu needs some waking call...she is way too negative about raja's all action n missing his protective n caring side though his way of showing care are different but still she is not trying enough to cooperate n taking things with negative perspective BUT still i will not say that it was her fault in stopping raja...she was horrified by the sight in front of her...infact it only shows her efforts to prevent her husband from committing another crime by killing someone.
actually both need to change their attitude specially raja...they are both into this n they should make it work...like how madhu previously accepted raju, a mentally retarded person with all his imperfections n tried to make this marriage work...i am wondering why she is not willing to take the challenge this time