I think we're a little too quick to criticise the rules and referees, and a little slow to criticise players for not adapting to the laws sometimes.
The clamp down on not rolling away is there because a few years ago, players had perfected tackling in such a way that they finished lying down between the attacker and his support. It was designed to slow the game down and was leading to dour, disjointed rugby to watch. The attacker will always be looking to get his body and the ball back towards his support after a tackle, so 99 times out of a hundred, if the tackler ends up 'trapped" and in his way, it's because he wanted to be there.
It's the same with the high tackle and contact with the head laws. I'm reading everywhere how the game is dead with all these red cards but at the same time, there are lads taking the game to the courts over brain damage and concussions - the law makers have been so clear about contact to the head but you still see high tackles every week. Players aren't adapting, maybe because they feel the cons of being penalised aren't as bad as the cons of allowing an offload or maybe because they're not being coached to but they're not listening.
I agree with you on consistency, and the Casey dummy was a nailed on freekick, but rugby is also more and more complicated for referees to adjudicate every year. There will be loads of little things like that in each game and as fans, we only ever remember the ones that go against our team so we scream inconsistency.