Scary Musical Interlude

I don’t know why, and maybe some of you can help me here, but this

https://www.youtube.com/watch?v=gMYNfQlf1H8

always makes me think of this

https://www.youtube.com/watch?v=29Mg6Gfh9Co

as well.

I find both pieces of music to be equally, and very, frightening. Maybe it’s the fanaticism inherent in both; I don’t know.