ET's (interdimensional beings that can reconstruct they're fire into any shape or form they see fitting or convenient for them at any particular time) have higher intelligence! The Global Elite, whom are "run" or "taken over" by these entities have the higher intelligence and compared to us (the common man of Earth or general population) they are of higher intelligence.

As a side note, star races such as The Grays, Bigfoot and the Reptoids (The very first biological beings created on Earth ) are all terrestrials and therefore not ET''s.