In a major new report, scientists build rationale for sending astronauts to Mars
arstechnica.com
arstechnica.com
"Defining objectives" is not the same as "building rationale".
"Defining objectives" takes the rationale as a given.
The moon is literally free mass, its already in space and we just need to refine it.
The moon is also closer to the earth so it can be used as a launch off point.
See the work anthrofuturism has done on YouTube.
The Moon is useful because its low gravity making construction of large craft easier, but you still have to get people and food there.