You can't put all of the "current group of conservatives" in the same category. They are all individuals, representing their individual districts and states, some of which are much more conservative than others.
Yes, this bill adds to the debt and deficit, but with the hope that the economic growth it allows will yield increased revenue that will at least offset the spending in the long term. Not to mention that it maintains lower taxes that allow more people to continue to keep and spend their own money as they see fit.
But I'm not going to say that it is a perfect bill, or even a very good one. But, again, it is the best one we could have hoped for given the current set of representatives. And those representatives are only reflections of the current voters. The country has moved more to the right, more conservative, which is a good thing, but I think we'd agree that it needs to move more in that direction.
So, it's good that you point out that this bill should have been better, much better. But it's also important to recognize that it is all progress in the right direction, pun intended. What is not helpful, however, is to go to the extreme of anger that leads to a fracturing of the GOP to the extent that it helps the Dems take over again at the midterms. If you think you're upset now, it is nothing compared to how you'd probably feel if that happens.