Human Robotics and Alien Mother Ships

In USA there is Senate fact finding mission on Alien Crafts and Alien Beings.

I am interested in both but here my concern is about unmanned ships.

Because of human hostility to aliens my guess is shrewd aliens have mothership in space (well away from human ariel reconnaissance) and only the robotics come down for surveillance.

Only with Ukraine war we begin to realise, the potential of Russian unmanned aircrafts and comerkazie (suicide) drones.

It has taken nearly 70 years from the Roswell crash for  humans to try unmanned ariel crafts without a base computer.

That is how we have progressed.