Note that we consider only the so-called direct actors, that is actors that use the system itself. Often there can be indirect actors who use the system on behalf of another person; we may note these down by don't concern ourselves primarily with them.
Starting with actors may help result in a usable system, but may do little to placate stakeholders. Some kind of modelling or analysis of stakeholders goals and requirements, and on-going project-wide risk analysis are important practices for all projects, however, they are separate activities from (and do not substitute for) beginning the modelling by analysing the goals and characteristics of the poor people who will actually have to put up with the system as part of their lives.