Fair enough.
However, if the economy goes into meltdown because people have no spending power, then unemployment rises, businesses fail, taxes fall etc etc all the things you list get cut back, then there is the human cost.
The monies other countries are spending, will find its way back into the economy and hence tax take, it doesn't get spirited away to the Cayman Is.
I expect the Tories to do the least possible, just enough to stop too many headlines of "Pensioner/Mum of 3 found frozen to death" but no more.