Napoleon says "no". You do that and then one day 300000 people show up with guns. The lesson of modernity is that citizen armies beat all other forces hands down every time; contractors may be incredibly skilled but at the end of the day they are not fighting for the future. This was what the Prussians found and the Soviets in Afghanistan.

Taxation isn't about morality, it's about functionality. It's about economic efficiency and social management.