I can see your point. However even in those examples each person was acting as an individual. If a majority make a certain choice it doesn't mean each person is not acting as an individual.
I think the main point is that economics cannot be based on equations like other sciences because of the complexity of individual action.
If you think about when masses of people made similar decisions, you can also trace back individual decisions that led to the masses making those decisions. One leader could make an individual decision that many people follow that completely flips a silly economic equation on its head.
Not sure if that helps or not. Just what came to mind thinking about it.