Massive events are difficult for people to assimilate - which is where conspiracy theories come from.
For a momentous tragedy like this, it is human nature to look for someone to take responsibility and acknowledge a fault, and offer an apology. This is a psychological desire to help the healing process.
In this instance - with so many others, such an 'apology' is not going to be forthcoming because the perpetrators beieve they were right in their actions, and an apology from anyone else would be largely meaningless.
We should move on - and that includes avoiding the swathe of TV reminders going on now, and through the weekend. It does us no good at all to relive this horror - we should remember quietly and continue with the process of moving on.