I rather like this quote of Tilly’s from his From Mobilization to Revolution (p. 5):
The analysis of collective action is a risky adventure. For one thing, there are too many experts around. It is a bit like food, or sex, or speech. Almost all of us know enough about food, sex, and speech to survive in our own environments, and none of us likes to be told he is ignorant in any of these three regards. Yet from a scientific point of view, we all have lots to learn about all three. The same is true of collective action.