On the question of “why not” I posit they are

On the question of “why not” I posit they are fully fueled and a go for launch on the Mar’s mission, no need to pick up moon rocks on the way even though Respert could parlay them into a lifetime supply of the highest end wines for his wine cellar. Their perceived trajectory which we can’t see quite yet suggests it doesn’t matter and the cargo on the other end is much more valuable.