I was alive when it happened. In fact, when I came to Chicago at the tender age of 21 in 1971, it felt like the execution of Fred Hampton was still happening here, even though it was two years before. Partly the reason the event felt so current in 71 is that the state's attorney in charge of the raid, Ed Hanrahan, was still state's attorney. Then he ran for mayor a couple of times.
I remember, as a young white guy, basically thinking "wow, those Panthers must have been really dangerous. Sounds like the authorities broke some rules, but they must have had a good reason for doing what they did."
The movie might not be a perfectly truthful history, but basically, on a scale of 100, I feel like l went from about a 5 to about a 95 in my understanding.