what's the difference if it's a true story or not? would you like it better if he put a "based on a true story" banner in the opening like Fargo?

I give you that the ending twist is a bit over the top but I don't see why should we give a shit about it being true or not. a lot of things that happened in past years, if I had seen'em in a movie before I'd laugh and say "it's just movies" like a killer tsunami washing New Orleans out of the map? an airplanes crash in air(Brazil baby) ? an austrian guy who had his wife and daughters locked in a basement and raped for decades? come on don't let that ruin such a fun film!