I think a lot of people are missing the context here.
Wales are 3-0 down, and it's completely unnecessary and a tackle from behind when you trail the player. The latter's been a red in the rulebook since the 90's.
Dont know if they changed it since, but it was introduced In the 90's that such a tackle should be rewarded with a red card. In slow motion it doesn't look particular aggressive as you dont see speed, context or intent, but the intention is clearly to hurt the player in frustration, as he didn't need to do that tackle at all (i.e Wales wouldn't have scored 3 goals had he let him run) - so if you just look at it in slow motion, then yes, yellow, but if you look at the intent, a red is fine.
As a ref you also need to make sure further players don't get hurt if you allow such things. Could have escalated with frustration-tackles had he not given the red. That puts players in unnecesessary risk of injury. The tackle in itself was an example of that, so a red is fine.
Wales are 3-0 down, and it's completely unnecessary and a tackle from behind when you trail the player. The latter's been a red in the rulebook since the 90's.
Dont know if they changed it since, but it was introduced In the 90's that such a tackle should be rewarded with a red card. In slow motion it doesn't look particular aggressive as you dont see speed, context or intent, but the intention is clearly to hurt the player in frustration, as he didn't need to do that tackle at all (i.e Wales wouldn't have scored 3 goals had he let him run) - so if you just look at it in slow motion, then yes, yellow, but if you look at the intent, a red is fine.
As a ref you also need to make sure further players don't get hurt if you allow such things. Could have escalated with frustration-tackles had he not given the red. That puts players in unnecesessary risk of injury. The tackle in itself was an example of that, so a red is fine.