Heck, until past century the crowds gathered to watch hangings, guillotines and other executions all over Europe.
And just past century the Germans burned to death 6 million Jews, gypsies, leftists, and homosexuals.
Then there are the lynchings as a means of justice (in the West) and for blacks in the South, plus other types of "mob justice" in which whole communities would often participate (or stand and enjoy the show).
Those Aztec societies were cruel, but "giddy excitement over" death extends beyond them. And at least they have the excuse to not have had modern science, schooling, wikipedia, and all tons of culture back then...