In Bedford's case Taranto's head was not driven into the ground, his right hip and shoulder took most of the impact on the ground, so safe to assume his aim was to 1. prevent TT from getting away and 2. prevent TT from disposing of the ball. Given how quickly Bedford tackled TT, who was crouched over getting away, then to achieve both 1 and 2 he laid the perfect tackle. Even if he had tried to retard him in any other manner, TT's shoulder and maybe his head could have still hit the ground. It's a contact sport involving tackling so do we want a rule that only allows 'stand-up tackles'? I don't think so.
Preventing TT from getting away or disposing of the ball doesn’t absolve Bedford of his actions, which directly contributed to TT’s concussion.
Nor does calling it a perfect tackle.
Bedford caught up to TT easily and was travelling at a quicker speed than him when he chose to leap onto him (with his feet leaving the ground), whilst simultaneously pinning his arms.
The momentum from his leap combined with his body weight meant TT was definitely going to go to ground, and in a manner that was highly conducive to his head hitting the ground given he had no way of protecting himself due to both arms being pinned.
The way in which Bedford executed the tackle was not the only way of doing so.
A good example of this was in the 1st QTR of tonight’s ESS vs Crows game at approx. the 13min 30 sec mark where McCrath (I think) caught a Crows player from behind (the same way Bedford caught TT) and pinned his arms and brought him to ground in an aggressive yet controlled manner (without falling or leaping into his back).
The Ch. 7 commentator even made the point of highlighting it as ‘carefully bringing him to ground’.
The tackle wasn’t soft or a ‘stand up tackle’ which you alluded to as the only other alternative to Bedford’s tackle.
McCrath either adjusted his technique for that type of tackle on his own, or it was taught to him at training. But it was excellent, and he was clearly mindful of what he was doing in the moment.
His tackle was a perfect tackle, and the end result was not just the luck of the fall.