It's because they aren't real supporters, the problem is the media have promoted these myths about them being this anti establishment club, who are completely different from Chelsea, United, Arsenal and City, despite the fact United took thousands away in the 70's and 80's when they were crap and their fans can at least take the piss out of themselves.
Celtic and Rangers fans can admit when their crap, the problem with the RS is they aren't really football supporters, Liverpool are a brand, they don't care about results per say, it's just about being able to pretend your a massive Scouser, see John Bishop. They think they're fantastic and that everybody loves them, that's why they get so annoyed about us and certain other teams taking the piss out of them, because they believe their beyond criticism.
Just look at the way the Evra situation was handled, every time they lose a big game there's kick offs between their fans, because they have no bond with one another, they're like people who wear nike trainers just customers, the best customers in the world. Their success in Europe was largely built off copying Red Star Belgrade's tactics and other Eastern European teams tactics, the Liverpool way is a complete myth, they have always employed yard dogs with a few players who can play football, their whole identity is build on lies and myths.