In this case, it is so much of a no-brainer that the author doesn't make much attempt to justify his statement, but he does lay out the wider landscape and discusses the issue of 'occupation' and squatting in the context of direct action around repossessions in Spain and in the context of John Rawls' concept of 'fidelity to law' (which according to the author's view, would be different from simply obeying any law that might happen to exist: think Nazi Germany, for example). By laying out the criminal penalties for squatting, the author does manage to convey that perhaps it is a 'brainer' after all - for those who would be on the front line at least.