I agree with Mishap and Grannylin
Obviously this, and other similar incidents are horrendous and evil but we do not know the facts.
We know nothing of what the children and their father had been through, or were going through. It doesn't necessarily mean that the mother was innocent, but I am also obviously not making excuses for the father.
I wouldn't wish what that poor woman is going through now on anyone.
There has to be a period of total insanity for anyone to commit a crime such as this and to be honest we have to feel for all the people involved and not judge who is to be classed as 'evil' and who is 'innocent' as the only innocents in cases like this are the children.
I haven't worded this very well but what I am trying to say is that we cannot judge anyone without knowing the full facts and the only people to know that are the parents.
I am in no way condoning the evil we have in the world these days - society has sunk to terrible depths where children and the elderly are abused, men and women battered by their partners, drink and drugs are 'to blame' for so much bad behaviour, and evil is allowed to flourish and basically anything goes in a society where 'I'm going to do what I like, who is going to stop me' - totally selfish.
Only by changing that attitude to one of caring for our neighbour and treating others as we would want to be treated can things improve?