IT IS WRONG.
Many people have played the blame game when it comes to these situations but at the end of the day, when all fingers have been pointed, hurtful words have been spoken, there is only one fact that remains.
They have killed. They have killed themselves. They have gone through hell and back. They will never be alive again. There are wounds that won't heal. There are situations that will never be forgiven ever again.
WHO IS TO BLAME?
Everyone. As a parent myself, sadly, it will still initially fall on the parent of the shooters for not noticing that there is something wrong with their child. Parents have the biggest responsibility of ensuring that their kids grow up right and when parents fail at this, the finger will always be pointed at them no matter how hard they tried.
Next is the system. These kids were bullied and perhaps, if the system just paid more attention and addressed it, it wouldn't have happened. Then there's the bystanders. The ones who have seen the signs and chose to ignore it. The media plays a part but again, this is all the chicken and egg scenario. If media didn't play things out and if parents and the system paid more attention and round and round it goes.
Lastly, the perpetrators. They may have been victims themselves but they chose to victimize others and taking away the life of others because you are mad at the world is still not right. It will never be right.
At the end of the day, we are all to blame. At one point, we have been the bullies, the victims, the bystanders, the system, and the perpetrator. Always remember that your actions or inaction has a butterfly effect and we never know when we become the trigger for someone else's madness.