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.
You’d think that genetic differences would be detected in some patient some day (who may or may not know of his or her past heritage)
Also more species means more diseases we may have no history with.