with easy games that will face Barcelona, Atletico certainly not going to simply give up the Spanish league title this season, because they also have an opportunity equal with Barcelona. Atletico possible for now only hopes Barcelona can defeat against Granada later.
In order for AM to win the title, not only both Barca and RM have to lose and AM to win in the final game, but also AM need to overcome the difference in goal difference (+80 vs +43) between themselves and Barca. What is the chance for Barca to lose by 20 goals and AM to win by 20 goals? Zero.