alt Hacker NewsConsider the persuasion of making a sale. That's not force. People can sell political ideas in the same way, they can spread virally.
EDIT: Also I consider economics, politics and marketing as basically "mass psychology". Hence all the problems with replication in those fields.
EDIT 2: And with these things being psychology, there's a big "default biological drives" component. A lot of the motivations for political etc actions are internal to each person.
The replication issues in those fields are partly attributable to the fields inability to explain behavior in terms of the biological imperative.
There is the theoretical rational actor which while very misunderstood is also subject to the stochastic and entropic reality. The 'internal motivation'
Persuasion can be divided into carrot and stick. The stick the implication of force against the individual and the carrot the promise of the ability to use force against other actors. This can be further expanded to negative force inherent from a relatively worse off position for not taking the carrot.
With some creativity all behavior can be formulated from a few simple primitives.