How is this acceptable?

Rating: 1/10 (24 December 2019)

Could someone please explain to me how it's acceptable to make a film about a true event and change the story?
If Tarantino's family or friends had been murdered so horrendously, I doubt he'd be so quick to trivialise and make fun of it. What a lazy and trite piece of work. I have been a long time fan but he's lost me now.