[Principled]

I'm not in the boat with the "voluntary" thing - but I do understand the position of those who are...

The thinking is that:
a) necessity spending is not taxed
b) discretionary spending is taxed but is voluntary
hence you can choose to pay tax or not....

FWIW

[Zon]

My take on the voluntary perspective is juxtaposition to gun to the head, threat of jail and financial ruin the IRS imposes on people.