Sadly, it isn't possible to manage, design or legislate away all risk. The UK has miles of substandard fencing because people keep pulling it down to take shortcuts across the railway. People WILL get hit by trains, just in the same way that they get hit by cars, buses and lorries.
I'm not bothered if the FS is taken out of service and put in a museum or put out to pasture at 25mph on a preserved railway, but the key to reducing the risk of a coupling/person interface is education in schools from the word go. Make it clear to kids just how horrible the aftermath of a person being hit by a train is and that the other side of the fence (even if it is mostly not there) isn't somewhere to go, at any time.
NR should identify the individuals in these videos and photos and throw the legal book at them as well as publicly humiliating them by publishing their names and faces in the national media.
The reason the fencing is substandard is largely because it's old, wooden, rotten and has fallen over on some of places I work