van-dyne:The premisses of the movie (Avengers: Infinity War) for us was always that because of what
van-dyne:The premisses of the movie (Avengers: Infinity War) for us was always that because of what happened in Captain America: Civil War, because Cap and Tony had fallen out, because the Avengers were divided. This is why they lose to Thanos, because they’re not together, they’re divided. – Anthony & Joe Russo -- source link