I'm catching up on Kill La Kill now and I don't understand why Satsuki doesn't just tell Ryuko in the first place about her father and shit and save herself the trouble? Ryuko would leave her alone then
She has her motives, just watch it
because she needed ryuuko to be angry and motivated for her plan to work
Watch the rest and you'll find out.
I'll spoil it for you right now, if you read it you are a faggot
Satsucky didn't tell about that because it's part of her plan to kill her mother, the big bad of the series. Satsuki trained the whole school to be an army to fight against the life fibers and if Ryuuko knew about this her mother could learn about the rebellion and kill everyone
I'm pretty sure Satsuki didn't know Ryuko's dad was her dad.
Confirmed for actual spoiler, don't read unless you are caught up or are a faggot.
I believe the only thing Satsuki knew is that. Ryuko's father was rebelling against the kirurin family and was eliminate because of that.
Don't read this OP
She didn't want her to leave her alone, she wanted to fight her so she could learn about life fibres and also so ryuuko herself could become stronger. Not to mention the whole point of it was to keep it a secret, you can't exactly just tell every transfer student what you're planning.