Perhaps there is an explanation, at least partially, how these types of myths, if indeed that is what they are, arise and keep being perpetuated. Carl Jung identified what he called the collective unconscious, Rupert Sheldrake calls this same phenomenon "morphogenetic fields",  the Buddhists have a name for it too, but I cannot recall what term they use but it is the same phenomenon. I just simply call these etherial banks of memory or energetic reservoirs, energy banks. Perhaps I'll make a post about it. 

In the West, our Newtonian mechanistic approach to the cosmos when combined with Judeo/Christian culture denies the existence of such things.  But exist they do. Essentially, human experience and consciousness is banked or recorded in specific banks of information or "fields". There is an energy bank for every imaginable thing from professional sports teams to the Democrats, to religions.  One can tap into these powerful source fields and be immersed in their energies. So this legend or myth of the Reptilian people gets perpetuated through these energy banks. One can quite literally access the information, the energies. Upon experiencing the specific info one comes to the conclusion that it is "real".  When in fact it is just energy, just stored information. 

Well, if you can grasp all of that without your cognitive dissonance alarms going off then you are pretty special. But I suspect this is what has occurred with the people who literally believe in all sorts of odd things: they have accessed specific banks of information from the collective unconscious. 

Well, there! Bet you weren't looking for that. Many blessings.