Baloney. 
These were GOP that wanted to vote in favor of these cuts, but knew that they would be voted out if they did. 
So, the GOP allowed the most in-troubled ones to vote against it, while insisting on probably a few of them to take their chances at the poll (likely gave them promises of PAC money, and perhaps Trump/Pence backing). 

Bad budget, and REAL bad idea of doing tax cuts. 
Far better for the dems to push a SANE taxation reform, rather than allow this junk to go through.