Or are we doomed to continue socialism, just because nervous nellies like you are too afraid of doing the right thing?
You would, of course, simply eliminate all other federal taxes and repeal the 16th amedment.
Most individuals would not have to deal with federal taxes at all in any way with an ideal tax scheme. You'd restrict tax communication to large businesses ~
As far as fair share is concerned, that depends on who is defining 'share' and 'fair' ~ and so far I've never seen such a tax proposed that would be acceptable to me!,
BTW, even postage isn't fair. There are enormous elements of cross subsidization that are highly questionable.