Well, what if it's more likely that there are quite a few different species of ET's working with Earth and their varying agendas. And what if one of them named the Zeta Reticuli are a particular race of ET's who have made a shadowy agreement with government agencies to give permission to harvest human bodies in exchange for technology? Perhaps they have damaged genes and are trying to create hybrids between us and them so that they can integrate soul, emotions, personality, and fertility into their particular genetic expression? What if these Zetas are very intelligent creatures logically but do not experience certain traits in our genetics that we take for granted?
Why are so many abductions carried out by similar greys of similar species? Why the sexual violations? And why the apparent lack of empathy??