I feel bad for all the people the were crushed to death during a haj event. It is a terrible way to die.
I hope that the people can avoid future disaster of that nature. It comes to my attention that there is an opportunity for innovation, a new technology that could prevent fatalities in crowds in the future; perhaps a sound system that prevents panic.
My mind goes back to the Love Festival in Germany a while back. Part of the problem is the panic caused when a crowd realises that there is a problem. The key here is to calm down the crowd before the crushing becomes lethal.
I even wonder if spraying a relaxing agent into the air would stop them from panicking.
In sense is thought to calm people down , maybe something as simple as in sense is the solution.