The point in showing the symbols, etc is an "in your face" mentality for the few that break through and see behind the curtains so to speak. It's a way to let us know that " see we can get away with what ever the hell we want and there's nothing you can do about it".
I don't believe in Satan and they may not either but they know how to control people with dogmatic ideologies (fear). The governing powers have done it for centuries.
Ever seen the murals on the walls of the Denver airport? How about the mural on the ceiling in the congressional hall? Filled with illuminati symbols and domination/supression images. These are a strange lot no matter how much you study them. They have their strange meetings at Bohemian Grove where they dance and chant to a huge stone idol and mimick a human sacrifice. All been caught on video tape and been reported on for decades.
It goes on and on and on.
One thing we can agree on at the end of the day...this lot is up to no good. They wreak of Conspiracy to dominate the planet.