If attending high school doesn't prevent murder then why are we blaming the decision to home school AL for it?
There is nothing that unfailingly stops everybody from committing a crime. No schooling decisions, no psychiatric treatment, no nothing.
Even if the parents went against the school recommendations at some point several years ago it is possible that his mother did all she could to get him help in recent times. It's not easy if the person is an adult and doesn't want it.
BBM. If it isn't easy then you just don't try at all? Being lazy is the answer? Let somebody else do it? Usually a personal value system and a respect for life is all that is needed to refrain oneself from engaging in mass annihilation of defenseless creatures.
You are making excuses for an inexcusable crime. Life isn't easy, taking care of difficult family members isn't easy nor was it every promised to be easy.
I'm betting a big help in preventing slaughter of such a grand scale would be to limit availability of automatic assault weapons, ammo and violent video games.
JMO