I think it is also because Taylor Swift stood up for herself, walked away from her music firm and started all over. She even had to record her own music again. Yet, she made it. She is still big, top of the charts and successfull.
She is an example of strong independant female to all those young girls
I have a young TS fan here and I can honestly say she has no idea of TS’s background and history. She just likes singing along to the songs as do all her friends. I very much doubt they even attempt to interpret the lyrics. For my DD TS is not an example of a strong independent female. That might be the case for grown women or older teens but not for TS’s main audience of under 12s.
I liked Kylie and Jason Donovan at that age and again I had no idea of what Kylie or Jason represented.
That is why I asked the original question of why TS fans but I think other posters answered that it’s just an easy target and not any different to underground stations and I think they are right.