I think it is "drawing a long bow" to call this an "attitude problem".
If Farrell were the only player attempting such 'massive' tackles then I could single him out as care less, insult his intelligence, and berate him for bad technique. But he's not. If he'd been successful then it would probably ranked in a best-of list of 'massive' tackles for the season.
His record might be relevant but his bad tackles that I can remember had no real chance of success because they were already illegal at the point he committed to them e.g. no arms.
Farrell probably failed here because he was too successful at blindsiding Atkinson. I don't think that Atkinson would have tried to step left if he saw Farrell coming - Farrell was too lateral to be in Atkinson's line of focus. So if Atkinson hadn't stepped left towards Farrell and dropped his shoulder then there would have been a spectacular hard tackle like hundreds of others I've seen. It would probably have whipped Atkinson's head to the side which could still have hurt him but it would have been entirely legal.
But what happened was that Farrell was already committed with no chance to bail on his tackle even if he had time to make that decision.
I would like to see less of these failed tackles because they could eventually, at the professional level, kill someone. But they're not going to stop unless tackles have to be below the shoulder/armpit.