We don’t need to go to the Moon in order to go to Mars. This doesn’t mean we shouldn’t go to the Moon. It’s just not a prerequisite.
I love this quote from John Grunsfeld, when asked about the radiation risk of a Mars trip: “How does that compare to the risk of blowing up on the launchpad or on ascent; getting hit by a meteor, asteroid, debris, some kind of space junk on the way there; burning up in the Mars atmosphere; burning up in the Earth’s atmosphere on the way back; or missing the Earth? You add up all those risks, and the [risk of radiation exposure] is kind of just another one.”