What is the right thing to do?

I watched tv program that was about very cruel accident happened in Akashi city 10 years ago.
That day, very big festival was held there , and a lot of people went there. And that happened on pedestrian overpass full of people. There , no signs to lead people to go in the same way, like people going to the station keep right, and people on the bridge were not able to move. And more and more people went on the bridge, and people in the middle started to fell in the ground and that lead people around them fell into the ground. and that continued chain-reactionly. And 9 were deceased because of too much pressure they get from the crowd.
The problem is , insufficient security. There were police men around there and security company held responsibility. But no one went to help and stop the chaos. Police passed the buck to the security company, and the security company did same. Finally, 5 were accused and sentenced guilty, but the chief and the deputy were not accused.

I felt the anger and sadness of bereaved families. But, they should have known that could happen any time, because this world is full of contingency. Having child is very responsible action. TV program was like all responsibility is police and the security company, but it is not completely correct. Parents should be careful danger of circumstances for children.
But of course, most of responsibility are police. I wish accidents like this will never happen.