I saw this video, which explained it for me (it's german, maybe the automatic subtitles will work for you): https://www.youtube.com/watch?v=hrJViSH6Klo https://

I saw this video, which explained it for me (it's german, maybe the automatic subtitles will work for you): https://www.youtube.com/watch?v=hrJViSH6Klo https://www.youtube.com/watch?v=hrJViSH6Klo He argues that the randomness you are looking for comes from quantum fluctuations, and if this randomness did not exist, the universe would probably never have "happened".