The whole thing is horrendous, and what I've read about what happened to those poor girls is awful.
But, and I know this might not be popular, I feel for him as well, because this is a massive failure by services - this shouldn't have happened.
My DS is autistic, his meltdowns can be very violent, I've written about them on Mumsnet before. There is no help. Even after I've had to go to A&E on multiple occasions. Two CAMHS assessments - both times turned down for treatment because they say his problems are due to autism. Police have told us they won't come out and that we need to do 'whatever is necessary'.
In these situations there's no magic number to call to get help or to get someone sectioned. CAMHS is completely overwhelmed.
In this case, the signs were there, help was asked for. Properly functioning services would have stood an excellent chance of preventing this, but our services are under-resourced, over-stretched and failing far too many people. And now three little girls are dead, with all that entails for their families and friends, many others are scarred for life, a young man will, most likely spend the rest of his life in prison and his parents will probably spend the rest of their lives having to watch their backs.