This is one of the things that made Liverpool to lose woefully yesterday they already made conclusion that they are going to win because the book markers picked them to win and since they believed that they have a better squad than Atalanta and their performance generally is much better than their opponents they didn't believe the game could turn against them but at the end they were allowed by Atalanta to have more control of the ball, posses the ball more but Atalanta made it difficult for them to penetrate their goal post from the starting of the game until the full time.
No I don't think Liverpool didn't take the Europa league seriously because they don't have any trophy at hand now winning the Europa league will be one of the best thing that will happen to them this season because they are not sure of winning the league since they have strong matches left and with the way the Arsenal team is going, they may end up winning the league that is the more reason Liverpool needs to do everything to ensure trhey get back to the game in the second leg in Italy.