A monolith had been found on Mars, which means one of two things:
1) Somehow an usual rock formation occurred.
2) Alien civilization.
Occam’s Trent Reznor says the latter is the possibility we must assume is true.
I’ve long said we need to declare war on Mars, and then if we eventually find life we’ll be prepared. It may be too late for that now. Our only option is to nuke the moon and show Mars what we’re capable of. We’ll be like, “This is what happens to large things in range of us!” Then the martians will know their monolith won’t be able to protect them. Unless they have like four monoliths.