You have to ask why they are doing it. Why forcefully push a player when the ball is going out of play? There is only one reason they would do it, and that is to hurt an opponent, or to "leave a mark" as it is sometimes described. If they try to stop it going out of play with a tackle and that sends the opponent into the hoardings then that is a very different kettle of fish, that's a genuine footballing action. Deliberately barging someone in the back, knowing they will be at serious risk of injury, is clearly endangering their safety.
They can't fix the grounds by having a bigger run off as grounds like QPR and Luton are hemmed in by housing, can't be extended, and the pitches are probably close to being the minimum size allowed for that level of football. I've lined at both and it does almost feel as though you are in the crowd. But it isn't just the smaller grounds, once of the most dangerous is Old Trafford because of the steep run off they have there from the touchline to the barriers. You barge someone by the touchline there and they are going to go hurtling down that slope, seen it happen many times.
And it isn't just the barriers. I can remember an England game when a defender and attacker were chasing a ball as the keeper came out to collect it. The defender got his body between the keeper and ball, the attacker forcefully shoved him in the back causing him to collide heavily with the keeper and suffer a serious injury. Think it was Gary Cahill from memory, and there was pretty much universal agreement that it should have been a red card. As I said, actions have consequences.
