Because of their hidden nature, none of these phenomena are all that credible in the eyes of nuts-n-bolts researchers or those with mere casual interest in the subject of aliens.

Therefore this aspect of the alien presence, which is perhaps the most ubiquitous, is also the least perceivable and believable by the greater majority.

This would benefit any covert agenda aiming to project a false front on the superficial perceptible level, while allocating all serious activities to hidden realms.

Alien abductions also have this duality. On the surface, abductions are purposed toward using humans for scientific study and experimentation, as biological assets for the production of human-alien hybrids, and for the training of abductees to campaign for disclosure, peace, environmental conservation, and other politically correct causes.

While these elements do exist within the abduction phenomenon, other less noble purposes are also present but kept hidden.