Campbell
Relaxed Intensity
Not really, no. Disposition is an "inclination towards" or "willingness", not "guarantee of". This is as erroneous as the "it's what my character would do" excuse. The typical counter to that comment is that a person could act in a number of ways and the player chose that particular (disruptive) action when they could have chosen another course. The same is true here. Any given individual may not act the same way in the same situation depending on a variety of other factors, let alone 10 different people.
Sure, and the way we establish that disposition in scene framed play is the GM decides because they believe that makes for compelling situation that speaks to the premise of the game and the player characters. That's the whole point - between a roll being made and the GM describing what happens next, they are making a creative decision constrained by the test result and there are any number of decisions they could make that follow from what has been established.