Why are people acting like Katy drugged those dancers and kidnapped them to come perform on her tour?

It was their conscience decision to leave Taylor, so if she's gonna write a song about anyone to be 'angry' at, it's the people that left.
Anyways, it's the music business. People leave and people join unexpectedly and Taylor's been famous far too long to act like she's exempt from being screwed over. Get over it and move on.