Let us say, for argument, that there are no reptile lizard people leading everything. Can we also agree, for argument, that much of the political and business power on the planet is, in fact, in the hands of just 1,000 people? That 1,000 people at the top have more power, influence, and control than 2 billion people at the bottom?
So, if we just call the people at the top lizard people (or whatever) it may in fact help us to frame a better way to live. A way that is not so controlled by the top 1,000 people. If lizard people is treated as a metaphor it may be useful. If it is believed to be true, it may still be just as useful.
Note: Just making an argument here to help you get along better with Dad.