I am old fashioned and believe that it is one of the refs prime tasks to look out for such incidents in game. If you can help him by bringing in VAR so much to the good. But do not take action based on a TV program 6 hours later that has no standing in football in relation to rules etc other than showing highlights to promote their program and justify the viewing figures.
Sorry but that's utter garbage. I don't see how you can claim to be old fashioned then in the next breath support VAT!!! Cannot see anything wrong with using video footage to deal with anything the ref has missed, whether it be part of an immediate VAR or if it takes further time to review it. One of the good things that Rugby has is the option to cite players for foul play. If enough get caught then fewer incidents are likely to occur. Let's not forget that those at the top of the game set the example that others below follow. If players know they are going to get caught out and banned and lose their place in the team then they are less likely to commit the offence (there will of course be some that will still think they can get away with it).
One of the problems I have with the new rule about diving is that you only get punished if the ref is fooled. Anyone seen to dive, whether they fool the ref or get booked or nothing happens should still get a ban if video evidence shows no contact.