They don't even need to agree.
Maybe you rubbed someone wrong and they just want you hurt, and so they use the media machinery to create a belief that is unshakable despite evidence.
My CPS friends lose more sleep at night over the kids in horrible situations who they can’t rescue due to lack of significant evidence.
And that's the other side of the pernicious tragedy of the commons that law creates. Pedophiles, rapists, murders, and ongoing abusers, get off the hook on both ends.