Tourists, go home.
The locals are less than friendly when Earth’s finest astronauts show up one day and start poking around the red planet in pursuit of Mars memorabilia.
Though maybe you can’t blame them.
Because if you look closely, most of the time the humans get zapped or chased or threatened in any way, it’s only after they’ve wandered where they shouldn’t have, and randomly started swinging machetes around.
You carve a chunk out of the local bat-rat-spider-crab creature, you can’t suddenly act surprised when it decides to try and eat you in revenge.