Crikey I think some people are getting a little precious about 1-2litres! If you cannot adjust your flight to fix that then you probably need some additional edumacation. Maybe an APS course on running lean of peak
Think about it for a second. What do you think is a common reason for running out of fuel? Would maybe not monitoring it well enough en-route be a fairly strong contender?
This rule is meant to make you monitor your fuel state better and tell you to divert to a closer place if you are knowingly going to eat into your reserves on arrival at the destination given your current rate of usage and eta.
If you don't monitor your fuel and you get lower than minimums, or run out, especially for no good reason, well I think you are an idiot and probably deserve penalty units!
Don't stuff around with fuel. Always have some for mum and the kids. CASA shouldn't worry you then!
P.S I agree that this regulation is a knee-jerk reaction to Norfolk.
You can try and make the world idiot-proof, but a better idiot always shows up at some point.