"But Mr Barakei denied this, and said the crowd had attacked Zada to prevent him from continuing his shooting rampage."
They did the right thing to kill this terrorist.
Do we have any independent (non-Muslim) data on what happened? Do we know with certainty that this guy went nuts and started randomly shooting, as opposed to recognising a known terrorist on the bus?
Not from what I've read, the police already had him on the ground, if the mob attacked him to prevent his further
rampage, why were his hands tied?
Does that preclude an investigation? I think not.