I'm free to attribute blame to many, one, none. Individuals or entities. Based on the evidence presented thus far. That attribution of blame may differ from that of the BTP▸ (British Transport Police), ORR» (Office of Rail and Road formerly Office of Rail Regulation - about) and the employers of the staff involved. I suspect it won't in this case though, unless the sequence of events is vastly different to that laid out in the RAIB▸ (Rail Accident Investigation Branch) Bulletin.
I wasn't remotely suggesting that you are not entitled to your opinion (we all are). I just wanted to understand how you felt you had reached a conclusion before all of the facts come to light. No offence intended.