Aside from cultural issues like abortion the Republican agenda seems so far removed from what their constitancy needs it's hard to fathom.
The next time Democrats are in control you'll be sure to see GOP complaints that the defecit is a problem and entitlements should be on the chopping block.
They are actually doing that right now, even though they created the massive deficit increase.
That's because to them, entitlements are the problem, and the deficit is just the standard excuse.
The real question would be "inflation adjusted per-capita tax receipts over time" but a mid-work googling didn't turn up anything promising; that being said from the above graph _and_ the knowledge that inflation is increasing, your statement doesn't seem to mesh. Feel free to point out if I was really thick and got the wrong data or something.
This is a false equivalence because the government and the private sector spend money on very different things. If the tax cuts end up being funded by reductions in entitlement spending, for example, the private sector won't funnel money into Social Security and Medicare to offset those reductions.
>If the Republicans are right, they'll spur enough economic growth to be a net gain across the board in both new economic activity (wealth)
CBO projections imply that the nearly all of the long-term gains from the tax cuts will flow to foreign investors [0], so it certainly won't be a net gain for the US as a whole.
[0] https://www.brookings.edu/blog/up-front/2018/05/10/cbo-estim...
McConnell is demanding that the Democrats work with Republicans to cut entitlement programs.
Even though they control all three branches and are the ones who passed the very expensive tax cuts.