While I completely agree with you on interstellar travel, I'd like to add the nuance that you seem to assume that there is no life in the Solar system other than on Earth.
That could very well be true... but we're not even confident ruling out life on Mars completely, and we landed there and took soil samples and explored.
Honestly, if there are extraterrestrials on Earth, I'd wager my hat that they're from somewhere in the Solar system. Just because the alternative is even more unlikely -- as you rightly argue.
No local drones or Dyson spheres, but we're cohabitating with a species capable of intra-solar travel?
Seems highly suspect. They'd need to be at roughly our level of technological development, which, if true, would be more likely to believe in a concept of "God" engineering that outcome than any kind of organic alien life.
That could very well be true... but we're not even confident ruling out life on Mars completely, and we landed there and took soil samples and explored.
Honestly, if there are extraterrestrials on Earth, I'd wager my hat that they're from somewhere in the Solar system. Just because the alternative is even more unlikely -- as you rightly argue.