Injuries

[Gasi]

But, hard tackling or not, if the opponent's facilities are not up to the level required or his players have poor condition (like sparklinginsilence said), why should we get penalised for that in terms of yellow or red cards based on the length in injury the player will have to suffer?

I have seen this in real football games, a simple tackle earns a red card because of the injury it caused, or because it happened in the 18 yard box.