Mars offers unique opportunities for exploration and investigation. Also, it could become humanity first step to thrive in space.
It is likely that we can find Mars have or had forms of life.
We will become the first known species to inhabit more than one planet.
In case of catastrophic event on Earth, humanity could survive on Mars.
We need investigate more how Mars lost its protective magnetic field. Also, it we need to understand what has happened to its oceans, waterfalls, and climate.