Have you? The concept was "pre-crime" which is stopping crimes before they happened - not investigating crimes that have already conclusively been committed. Additionally, upon finding the system in use was faulty it was dismantled and everyone affected by it given a pardon.
Not saying the slippery slope argument is invalid, but the use of Minority Report is better kept to arguments where the intent is to use "big data" to predict and prevent crimes - not for when crimes have been committed and the intent is to figure out who did it.