It’s easy for them to process us if there is only one world government to deal with/control/conquer.
In other words, their stated goals do not include conquering humans in the classic sense.
Some abductees have said that their ultimate goals seem to focus on joining with humans to share in our experiences of life on this planet by indwelling our minds, bodies, and spirits with us. How this involves the creation of hybrids is unknown at this point.