The good news is that Earth will have the last laugh. These people will grow old and die in a fraction of a geologic blink. They’ll be tossed down a hole or incinerated and then finally serve a purpose as their component elements are recycled. If any monument to their memory is erected, the rain will patiently grind it to dust until it too is fully consumed. That’s assuming their grave stone (or similar marker of the fading stain they’ve left behind) isn’t knocked down prematurely by unruly future passersby.