How can "nobody" be responsible for a stampede?

Last week, a stampede in Cambodia killed 351 people, and it was recently found that nobody was responsible. But how can "nobody" be responsible for a stampede when it was clearly the fault of everyone that took part in it? That is just bollocks because there were more than 1,000 people taking part - they were trying to cross a narrow bridge while celebrating the end of an annual Water Festival on a man-made entertainment island, and the crowd suddenly panicked and started to run. So I don't believe those bellends when they say that there was nobody to blame - there was at least a thousand people involved.