Why go back in the first place?

Rating: 7/10 (20 April 2019)

Our hero is stranded on Mars by a sandstorm and his crew members leaving. This premise didn't bother me at all (although scientifically inaccurate). I just accepted it and went along with it.
The visuals were great. I think they did a great job in creating a plausible Mars base. This is the best element of the movie!
I'm also glad we didn't get a soppy family story from our hero himself! In the likes of: "I need to get back, for my son". I wondered though:
Why go back in the first place?
Billions of dollars have gone into getting the crew THERE!

Psychology, they have accepted their likelihood of dying.
Realistically, even dying on Mars should be a personal honor. If astronauts are going to Mars it'll be a one-way trip right?
Scientifically, why use all these resources to go back - and save one measly human (no offence). We should accept that. Probably the first missions will be about building as much as possible. Can we create a self-sustaining Mars?

Other scientific things that did annoy me:

The ungodly amount of duct tape.
The lack of communication
The bombs

Either way, despite this, the film is entertaining, visually stunning and filled with great actors. It is an okay movie experience.
If you expect a cliché Hollywood movie and get a cliché Hollywood movie - you'll be content.