NASA Announces Discovery of Flowing Liquid Water on Mars

From what I understand, the hydrated salts that indicated the water are/are an essential component of one type of rocket fuel, so there is that. Regardless, fuel isn't enough. The fuel that we know for sure exists is not abundant enough to travel all the way to Mars to get it, unless we were already headed that way.

The moon on the other hand has structural metals that can be moved to space for a very small fraction of the cost to do so from earth and is close to earth, when compared to Mars.