A separate pot for extra NI is just smoke and mirrors - a tactic that has worked for Boris in the past. That extra tax is needed to cover extra costs is undeniable - presentation is important.
The rationale for the separation of NI and basic tax is weak - a historical legacy going back to the days of a physical "stamp" which qualified individuals for certain state benefits (pension). There is no logic for sparing pensioners with sufficient income from the burden of NI when those younger with the same income pay it.
Provision of some state funded services are generally regarded as socially desirable - eg: NHS, social care, education, state pensions, safety net. They ensure all individuals can access basic human needs irrespective of personal circumstances.
Other state spending is a consequence of political and economic policy - eg: defence, environment, international aid, transport, etc. These are provided for the benfit of society as a whole and are not a consequence of individual circumstance.
A rather simplistic separation, but one which could be used define "tax" vs "national insurance". All who live here benefit from the latter, only those who have contributed should benefit from the former.
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