Yep. We have nothing of physical value for ETs that have learned to instantly transit space-time. The concept of conquest/killing is of lesser minds stuck in one limited place.
They may watch us for ideas to bring to their own civilizations. Possibly even taking in specimens to study. Like when we closely study animals for inspiration to create better machines and software.
I also think they watch emerging civilizations and do interfere when technology can disrupt their own timeline. Things like nukes and particle colliders may have effects on space-time we still know nothing about. Sort of like watching primitive civilizations that are just discovering fire but without any knowledge of how much damage it can do if not controlled...
I think so too. The keyword is “time”. I think they only interfered or approached in small ways now and then throughout history to make sure we do not seriously change what will be our future but would also change their past. Because changing their past would also greatly affect their present.
IIRC it was Philip Schneider said that the Human Thymus Gland is like Cocaine to the Reptilians. Also during the Dulce Base incident there were reports of the EBE's soaking in vats of Human blood and body parts like it was a Spa on the level that is called Nightmare Hall.
https://allthatsinteresting.com/dulce-base
For those interested there's many videos by Phillip Schneider online.