What would make sense to to me is that our inner processes are responsible for attracting rather than creating the characters involved in corresponding experiences. In other words, aliens can exist and have their own motivations, just as we exist and have our motivations, but it's our shadow that makes room for them to become involved in our experiences. It's like people with a victim mentality who seem to attract misfortune and abuse by predators...not that they created the predator, but that they attracted and allowed the predator.
This viewpoint's a compromise between the "aliens are projections of the collective unconscious" and "aliens are here to do whatever they want." The reason it makes sense to me is because it's just a scaled up version of what happens in our personal lives, how what we encounter on the outside does reflect what's going on inside.
Also, let's not forget that archetypes transcend boundaries, expressing as psychological phenomena, biological, physical, cosmic, etc... -- the reptilian archetype may express itself psychologically as the more primal and calculative parts of our own minds, or may be embodied in an actual physical race for whom that archetype is the primary basis of their evolution. We can be lionhearted internally, and lions can still exist in grasslands externally.
So perhaps it is simply a matter of one archetype being found in both the internal and external world rather than the internal expression of the archetype necessarily creating the external expression. In the case of aliens at least, since the alien phenomenon does include tangible elements based on physical evidence like documented scars and scoopmarks, UFO sightings, multiple eye-witness accounts, surgically removed implants, missing fetus syndrome, govt/military personnel testimony, etc...
No doubt our darkside can project external thoughtforms, as may be the case with certain categories of demonic entities. But there's just too much physical evidence associated with the alien phenomenon to write them off as figments of our subconscious.
Still, if our internal world has an influence upon what characters and experiences we attract in the external world, there is still much reason to look within ourselves and resolve our issues, face our darkside, etc... based on what we see outside of us: Reptilians as Luciferic entities and Grays as Ahrimanic entities, giving us pause to consider our internal predatory and mechanical tendencies.
But then again, we could look at anything outside and find some corresponding meaning on the inside: rocks to reflect our inner strength (or dumbness, haha), birds to reflect our drive for freedom, Neo to reflect our inner messiah, and so on.
Acquiring fringe knowledge is like digging for diamonds in a mine field.