The tragedy in Meron

Have a good week, Rabbi,
I would like to ask a few questions:

1. I understood that the disaster occurred as a result of a domino effect, when the pushing of the first in line led to the trampling of the last in line. The question is what is the extent of the responsibility of the various people, whether as ‘accidental’ or ‘accidental close to rape’ or as ‘accidental close to intent’, etc. We have been denied the obligation of exile. For example, we can say that the first in the dominoes must be exiled, because they pushed so that there would be space and air around their place, while those who were pushed and trampled on the others are like rapists because they pushed and trampled on the killed by choice. What do you think?
2. If someone bought a ticket to Meron in advance and didn’t get there, whether because the bus didn’t leave or because it turned around while traveling and was returned to the same place without reaching its destination, does he have the right to demand his money back? And does it matter whether he has already paid or not?
3. There is now talk that in the coming years the number of people ascending the mountain will be limited to prevent danger. When the Temple Mount is built in the Old City, will there also be a limit to prevent danger? And who will be responsible (Sanhedrin, High Priest, someone else). And if not, can a person refrain from making the pilgrimage for fear of being crushed to death?
4. Is it true that we can say that ‘Rabbi Shimon bar Yochai is worth relying on in times of need,’ or has it already been proven otherwise?

I would be happy if you would answer me in detail in order.
 
Thank you very much!