Maddy had no business starting a fight with Cassie when she was confronting Lexi on stage

Literally, this makes absolutely no sense. Why did Maddy stoop up and started attacking Cassie just because she disagrees with her sister? Wether youre on Lexis or Cassie's side, Maddy had nothing to do with any of this. This makes no sense at all. It was forced so the show could get more drama by getting them into a conflict.