Once someone puts in this time, we can see why there is a cause, and how to affect it or learn from it.
For instance, the real reason people are rioting when food prices go up is that, in those parts of the world, the people spend 80% of their money on food.
Without knowing that, you could make all sorts of predictions about why people in Syria are rioting while people in the U.S. are playing Fifa.
Also, I appreciate the scientific method, but it is not true that we can not know things without it. For example the people who go rioting because they are hungry know that they go rioting because they are hungry.
Over time, lots of people have rioted because they were hungry, and the knowledge has slowly attritioned into the public body of knowledge...