[gohrt]

Safety measures aren't enough. The requirements are impossible: In finite time window T, N people attempt pass through finite region R. N increases every year, past the point where they just don't fit.

[mohsinr]

Number of peoples have not increased for last 10 years! https://en.wikipedia.org/wiki/Hajj#Number_of_pilgrims_per_ye...

Looks like some other factors contributed to this very unfortunate accident.