Yeah away teams not under the emotional pressure of the crowds may keep their cool better and not cross the line into getting cards. You'd need some objective

Yeah away teams not under the emotional pressure of the crowds may keep their cool better and not cross the line into getting cards. You'd need some objective way to determine if fouls deserved or didn't deserve a yellow card and be able to show that the same fouls were still being committed, but the refs were judging them differently.