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It might surprise you to know that public sector employees also pay tax and NI, so they are contributing 3.2% as well, in addition to their individual contributions. Which, incidentally, are a lot higher than 0.7% in most cases.
Don't start this rubbish again, they may 'pay' tax but they do not make a net contribution to the exchequer.
The government could for example, cut their pay by an amount equal to the tax they pay, then give them a dispensation to pay no tax. The public sector workers would still the same money to spend and the exchequer would be no poorer.