Chill, it’s a handful of stuff on an entire freaking planet. Sure Mars isn’t as big as Earth, but it’s still huge. You would be hard pressed to even find a single trace of man if you’re on that planet.
It’s a clickbait title, look at how bad the humans are. In the grand scheme of things this is a nothingburger. The benefits vastly out way the potential downside of dropping some stuff on another planet. Even if there is some trace of life there, dropping a little bit of stuff doesn’t harm it in any way.
Also remember the scale here, it shows as dots on the map, so you think there is a lot. But in reality the size of the stuff compared to the size of the planet wouldn’t even show up on a picture. It’s not even big enough to be a single pixel. If the resolution was 10x greater, it still wouldn’t be a single pixel. It’s like those maps where they show the space debris around Earth to make it look like there is a lot. It’s tricky to spot anything man made on Mars with high powered optics in a low orbit and knowing exactly where to look. If you can see the whole hemisphere, you ain’t seeing shit.