Your assumptions seem to be greatly flawed . . .
though our missiles against them have been largely ineffective due to their advanced tech.
Reportedly they were not quite prepared for some of our radar installations and their effects on the UFO craft when Roswell happened.
They reportedly adjusted their stuff and didn’t have THAT specific problem again.
Besides . . . technology is never flawlessly perfect in all unforseen contingencies . . . even ET technology.
I will believe in ET only when I see one land
The kooks can preach till the cows come home.
I am not impressed by any so called sightings.