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Why do people see Mars as a better target for human colonization than the Moon? Most comments on lunar colonization seem to refer to two facts:
In my mind, both of these problems can be solved by a ceiling or dome structure. The ceiling both retains the atmosphere and also blocks harmful radiation. Note that a failure in the ceiling won't be catastrophic: the atmosphere won't drain rapidly, and the amount of radiation exposure per unit time isn't disastrously high even without the ceiling.
Mars has pretty low gravity too, maybe Luna has enough to protect health. Mars atmo at .05 of Earth.
Mars has pretty much no magnetic field also, just a few (unexplained) loops that look like solar prominences.
Luna much easier to supply.