"Tax is good".
This is silly. If tax is good then taxing us more and spending the money on anything (faster HS2, more useless PPE gear, 5* hotel rooms for every MP in London, ID cards that are never implemented, a giant pyramid for the royal family, a super expensive rocket ship) would be a great idea.
It clearly isn't. In fact it's better for that money not to be taxed and therefore it is free for the private sector to allocate it more usefully, which it frequently does.
In my mind there are some things that are better funded collectively through taxation, and some things that are better funded privately. Which those are are up for debate.
In fact most governments recognise their own incompetence, in the respect that when they talk about spending and taxation, they nearly always talk about reducing spending through "efficiency saving", acknowledging the fact that things are done inefficiently (this usually translates to anything but, but that's another issue).
In fact IIRC this was much of Labours line throughout the election, that they were not going to raise taxes, or reduce spending, but achieve improvements through "efficiency saving" and "growth". This doesn't seem to have turned out particularly well. So now the usual line is being followed, that it is something else out of our control that was done by our predecessors.
Rather than the fact we lied in the first place.