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The same would happen if they were all tightly packed in a small venue, and at the end of the conference there was only one exit down a narrow path.

For the record, a similar issue happened in Korea not so long ago at a Halloween festival where people weren't even motivated to go a specific way, it was just too overcrowded:

https://www.bbc.com/news/world-asia-63443044

Doesn't really shout "scientists", this article LOL.

> type of people that would not engage in such barbaric actions

Please, please inform yourself.

You are holding some vile misconceptions.

> I find it easy enough to imagine a type of people that would not engage in such barbaric actions under any circumstances.

None of the people in the back intend to cause injuries to the people in the front of the crowd, nor do they even know what's happening. The cause of crowd crushes is not the "type of people assembling", as evidenced by the wide variety of crowds that experienced crushes.