Although humanitarian intervention is never politically neutral, Mapel maintains that this point can be overdrawn. Arguing that humanitarian agencies cannot always actively pursue political agendas, Mapel asserts that the objectives of such missions must be determined on a case-by-case basis. Pushing the issue a step further, he argues that in deciding whether there is an obligation to intervene, the nature of the conflict, the costs and risks of intervention, and other factors must all be taken into consideration. Mapel concludes in support of Winston's call for a standing UN military force for humanitarian interventions but notes that debates over the objectives of interventions and the nature of justice in complex situations remain obstacles to the establishment of such a force.