But it's not like Liverpool have been defending every game and not done any attacking, is it? They have played lots of games this season, have a few injuries - notably to Mane. Why risk your first team players in a cup game, on a potentially poor pitch when the CL is just a few weeks away? With the way they have been operating, Klopp does seem to have instill the mentality into them where they can just do both sides of the game comfortably.
They will likely beat Atletico because they are simply better than Atletico right now. Atletico may be fighting for every result at the moment but they haven't been playing great and have struggled to score goals all season.