I don’t think that the leftist support for Dorner has as much to do with LAPD as is does with the left’s agreement with the evil spewed forth in the manifesto. Frankly if Dorner had killed a random group at starbucks I think you would see the same level of support. The left worships at the alter of depravity.
The things you point out are why many on the right don’t care (or are happy) that he has killed a couple of LAPD cops. There is no support for Dorner but there is no concern for the jackboots either. It is just two enemies fighting each other.
The enemy of my enemy is, well, probably just another enemy.