Fans are rabid against Cutler bc they were promised the one thing the Bears never had. A legitimate long term franchise QB. The fantastically incompetent organization could never draft one so they traded for a growing QB with the arm and potential and claimed they got their Peyton Manning and he would just do everything. To have the hope of getting what one could never have and having it crushed is pretty painful.
The inability to get a QB is pretty surreal. In the last 40 years you had Rex who gave the promise with one great month then disasters, Kramer a mediocre career at best who gave one great outlier of a fun season and McMahon was good but made of glass. Those are really the only 3 worth even mentioning over those years. Maybe Rick Mirer too, what a trade.
They promised Jay was IT and he wasn't for a few reasons. Now it's up to this franchise to have to actually do something they have proven they can't, draft and develop a good qb. Don't hold your breathe