Why are there subliminal messages in childrens movies and in artists' music?

examples: walt disney's 666, sexual content in disney movies, lady gaga putting her hand in front of her eye to say he is inspired by the satan, nicki minag also putting her hand in front of her eye in the music video super bass, Rihanna being captured in a triangle dressed in white (which means being raped by the devil) in Umbrella music video, and in the S&M video princess of the illuminati appears quite often in the newspapers. I don't believe this but i feel i am forced to by all this proof, any reasons for whats the reasons for this?