Nice to see credible folks pushing for more disclosure. I believe there have been some recovered craft, and that they did not have any occupants.
I dont think theres any concern about a mass contact event. These craft are studying the planet, maybe taking resources and samples.
I think its incredulous to believe were the only intelligent life when you fathom how large and old the visible universe is.
A number of credible pilots have also given accounts of encountering these craft and how we know they are intelligently operated, and have defensive mechanisms.