This approach is assuming thermodynamics as a unquestioningly true law. That could be fine for a student that is learning physics but not for a scientist. Tre

This approach is assuming thermodynamics as a unquestioningly true law. That could be fine for a student that is learning physics but not for a scientist. Treating something as unquestioningly true is a sign of belief and religion. Now, for most everyday situation it is practical to assume that a device can't be creating energy from nothing, can't be ordering atoms in two containers without using energy, because we know there exists second law of thermodynamics. But Maxwell's Demon is an experiment specifically aimed at testing thermodynamics. We can use the second law of thermodynamics exactly because we expend/expended effort to test it to a sufficiently high degree and we are revisiting as we learn new facts and push the boundary.