Its pretty clear from your post about their handwritten bill above that they really don't need a comprehensive, or even a coherent, tax bill. They just need to convince their donors they can deliver SOMETHING, anything.

If the bill is passed, which it almost certainly will because they have the majority, the true costs will not be known for many months, even years, due to so many of its delayed-action Trojan horse and time-bomb provisions. When the deficits start accumulating, and the trickle down fails to show up, either they will blame it on the Democratic administration then in power, or they will have the excuse they need to implement further draconian cuts in welfare programs, particularly "entitlements". I can hear them now; "Deficits are devastating the economy, inflation is taking over, we have to cut back on social programs and stimulate business with another tax cut."

Medicaid, Medicare and Social Security will be targeted. You watch, even though every single Democrat will vote against this obscenity, it is the Democrats who will be blamed for the gutting of the New Deal social programs, the runaway inflation and the ballooning deficits. And it will be up to the Democrats to save the economy from total collapse by propping it up with massive government spending. It happened in 1929, and again in 2007. Except THIS time, there won't be a Roosevelt or an Obama to bail us out.

The Republicans are guilty of the same sin the business community they represent is guilty of: an obsession with the quarterly profit report, and the failure to plan for long-term viability and sustainability. They are eating the seed corn and fishing with dynamite. This short-term attitude is not just in economic matters, its in political ones too. They can only see as far as the next election. I don't agree that they will all then turn on Trump, unless the crash comes on their watch and they need a scapegoat. As long as the economic boom continues, they've got the tiger by the tail and they don't dare let go.

No one is in charge.