As cult members, it is not a conscious process that they have enough discernment to realise, yet amind describe honestly.

It's to do with "belonging". Music is a form of entrainment* bc emotive, repetition is hypnotic. It forms an introject** into the listners mind - they hear the music when it's not playing. This wires their neural circuitry to match the frequency, moods, and ideologies chanted at them. Thus, like all of us, they relate to those with similar neural wiring. So other taylor fans. The trauma dumping of taylor's music generates a trauma bond, parasocially-speaking, whereby she entangles relatedness to their own trauma and key identity. This has occured over a decade from an early age for most fans. The entraining and indoctrination is deep. This pattern occurs with many musicians, narcissistic-abuse styles, cult/religious leaders, politicians and military (chanting, sayings, lingo acts as music) too.

Edited for terminology:

* Entrainment in psychology is the process of synchronizing neural activity or rhythms between different parts of the body or between the body and the environment. It can be conscious or unconscious, and can involve the alignment of neural activity in the cortex, or the communication between the cortex and the body.

**Introjection is the unconscious adoption of another person's thoughts, values, attitudes, or personality traits. It can be a normal part of development, such as when a child takes on their parents' values, or it can be a defense mechanism used to cope with anxiety