Loads of reasons:
* Our defenders aren't that good. Well, they're not as good as the infamous back fours we had through the noughties.
* We haven't got a true DM. Even with Lucas there we afford the opposition acres of space infront of our back four.
* We're not as industrious in midfield as we once were. Under Ged and early Rafa we had a flat bank of four who were hardworking. Latter Rafa we had two strong holding players and the added protection of a fit and flying Gerrard. We now have more flair and less graft.
* We don't score enough goals, so we invite pressure and inevitably make mistakes. We also throw too many players forward and leave ourselves open trying to get that elusive break through.
* Attacking fullbacks. We lack players that, like Arbeloa, Riise and Finnan did, tuck inside to become the third centre back. Couple this with a system where the fullbacks are now wing backs playing on the half way line. Which inturn leaves the centre halves playing wider without a real DM dropping in. It's suicidal and Rodgers needs to bend it a bit to make use of what we have, rather than trying to achieve something we don't have the players to match.
* Our keeper is on the decline, and we've had a mismatch of systems and marking procedures implemented and then done away with due to changes in staff and management.