I suspect you will find it is ignoring the published scientific evidence that shows a closed mind there Rod
I took that out deliberately Red, I didn't want to let the argument degenerate, you saw it though, so I apologise.
Red, where is the scientific evidence that the bag tax doesn't reduce litter?
You're throwing up a smokescreen of science when it's not a scientific problem (unless sociology is a science) - as a society our attitude to litter sucks - other societies with the same problem addressed a small part of it, namely the free carrier bag, and have seen a marked improvement. Where does a scientific evidence requirement appear in there?
Apart from the scientific evidence red herring you're throwing out a list of other components of the litter problem, if the bag tax only reduced the littering of carrier bags then there wouldn't be the marked reduction in litter overall. It's NOT the tax on bags, or the lowered use of them, it's the change of society's attitude caused by needing to think about their actions that makes the difference.
And in the end, if it's a small step, you don't not make it because it doesn't fix everything, you make the small step and look to the next one.