Look at the exchange between Trump and Kim Jong-un. It appears that nuclear war is possible. This makes for a number of hypothetical theories. One thought is, is the human race so addicted to war that they would destroy themselves for reasons that are petty? Even if the reasons were deeply moral, is there any excuse for world wide destruction due to nuclear weapons use? Are humans that foolish?
A writer, John Brandenburg Ph'd, has theorized, using maps of Mars and readings of concentrations of various chemicals and elements in the atmosphere, and from samples of the surface. The results of his inquiry suggest that Mars displays the vast devastation of a conflict, or slaughter, caused by two immense nuclear weapons upon Mars's surface. Did the Martians do what Humans on earth are approaching doing?
In the series The Damned, Alan Dean Foster explores the fact that humans are warlike, and so warlike they make perfect allies in a cosmic war. A war that leaves behind devastated worlds. The humans are feared by the alien beings due to the human race's violent tendencies. Humans are to be avoided, because they are so violent, they would destroy themselves and their planet, if they feel the urge.
Mars has been the subject, setting or source of interest, in many science fiction tales. The Martians have been presented as malicious, or long since dead, or the last of their species. The general desire to settle Mars is ironic, if, humans destroyed their own home, only to learn that Martians did the very same thing.
“The Men of Earth came to Mars. They came because they were afraid or unafraid, because they were happy or unhappy, because they felt like Pilgrims or did not feel like Pilgrims. There was a reason for each man. They were leaving bad wives or bad towns; they were coming to find something or leave something or get something, to dig up something or bury something or leave something alone. They were coming with small dreams or large dreams or none at all...it was not unusual that the first men were few. The numbers grew steadily in proportion to the census of Earth Men already on Mars. There was comfort in numbers. But the first Lonely Ones had to stand by themselves...” Ray Bradbury, The Martian Chronicles
Colonization of Mars has long been suggested to be a future event. Mars itself does not always get presented as the wasteland it is, it seems, but it has captured the human imagination. The imagination is allowed to inspire visions of Mars that are not accurate, not even close.
If humans desire a Martian presence, perhaps it is because they are reminded of home, in a future sense.