Sadly you’re spot on.
Abusing and deriding managers and players simply doesn’t work, as we’ve found at great cost.
But it isn't the thing that sends clubs into a spiral. Look at any club that has a prolonged history of success and then look at how the fans and crowds have reacted during lean periods where they've finished midtable or maybe even just been way off the title chase.
They've abused and derided everybody at the club. And historically those clubs have usually got their act back together at some point and cycled back into their periods of success despite that negativity. And then the fans have gone back to a show of positivity.
Look at Goodison back in the early 80's - it was not a nice positive place to be early in Kendall's first spell. Pointing fingers at fans and their negativity for the continuing misfortunes of a badly ran club is demonstrably incorrect and even the most casual look at the history of lots of clubs tells you this.
It's yet another myth for the Benitez apologists to hide behind.