If a player does the wrong thing to the point of being worthy of a send off, send them off. Just be consistent, is it really that hard? If they bring in this sub for an in game idiot rule, it is just another way they are trying to cover their own incompetence.
Was the send off decision harsh? Maybe. Was it a travesty? Heck no as it was a legitimately bad tackle. This is where the ref should be supported, not lambasted. The problem is not this tackle, the ref did what he thought was right and BASED ON THE EVIDENCE, is a fine decision. However, BASED ON CONJECTURE of course all the talking idiots love to talk it down because it was detrimental to Manly. Well guess what, blame the player in the wrong here not the system.
The problem is far broader when you have someone like Tupou not even getting binned despite a legitimate coat hangar that only a touch judge couldn't see was worthy of at least a sin bin. Look even a send off there I could live with if it was consistent. Binning a player for tackling legitimately but JUST A BIT TOO HARD is not consistent with the rules.
So in summary, if a player like Lawton does a bad tackle like that, his team SHOULD feel the consequences of that because you don't want that in the game.
I don't often say it but well done to the ref in this instance. Oh and leave the rules alone!