You didn't read anything in earlier threads did you, "new" anon? Your position is one of lacking understanding, research and knowledge of the 40,000+ft view. The answer you're looking for is Universal Law. They cannot violate that. We as a species collectively give our consent with tacit approval via free will to be farmed. If you were a species controlling this planet you wouldn't want anyone to know anything about you, and with current IT information can be shared worldwide instantly. It's clear they will not and do not physically intervene with human tech capable of detecting them unless absolutely necessary.
Also, you failed to register the most important point of all. They already have this planet maximized by its slaves both for farming negative energy and free reign to harvest all natural resources from inner earth.
What else do they need to do? Q, The US military and all of its black budget craft and energy weapons still cannot touch them, so why would they feel threatened enough to attack US military hardware? What's the point? They can fly circles around anything humanity has in production. Why take a shot that will raise alarm?
The planet is under total lockdown by the "good" ones until we as a species wake up to acknowledge our slave masters. No reptilian or pleiadian baddies are going to raise alarm by killing the president or attacking any US military personnel or assets. These are piss ant toys compared to their tech which is easily hundreds of thousands of years more advanced. No offence to Q, they have some goodies, but still nothing compared to the higher species.
Thousand year old? Try two hundred thousand year old. Our little changes in macroeconomics and politics is but a mere blip in their eye, our rise of civilization in the past few thousand years is nothing. We have had advanced civilizations come and go. Civilizations rise and fall like the tides. We are but a grain of sand in an infinite ocean to those beings, children, ants running around. We pose no threat to them or their species, nor does any human being or any technology we possess warrant direct action against.
Pay attention, go back and read, this stuff is important.