Are you sure that was Chile? For some reason, I always thought that was somewhere in France.
A lot more has happened. You can hear on a lot of bootlegs how Bruce has to cool the audience down because they keep pushing and all that. Also, you forgot to mention how Maiden cancelled a Brazilian (?) gig in 1998 because there was no safety barrier.
But, I don't think this is actually falling back on the South American fans. All the people I talked to acknowledge that South Americans are simply a lot more passionate. It's the same with football, apparently.