If the charge was "thrown out" as suggested, there can only be two reasons.
Reason 1: What he was charged with did not occur (ie, there was no headbutt). Clearly, there was.
Reason 2: What he was charged with is not a chargeable offence.
Clearly, the NRL judiciary have declared that anybody may now headbutt anybody else with absolute impunity.
Furthermore, if anyone at any time in the future of the NRL is suspended for a headbutt, they can rightfully point to the precedent set when Jarryd Hayne not only initiated the confrontation with his grubbiness, but then deliberately slammed his forehead into the face of the opposition player for daring to stand his ground, and was not suspended.
The judiciary have set a very dangerous precedent, all so the golden child can play.
I really feel for the match review committee. They must wonder why they bother at all.