That demonstrates absolutely zero long-term thinking...
I could list a number of reasons, and I'm sure most of them factor into the decision making at least somewhat:
1. From an ideological perspective, they don't want the govt providing any help. They are willing to toss these people off their plans because they do not believe the govt should be propping them up. Therefor, it has nothing to do with what is efficient or economically beneficial.
2. Special interests, donors and some of the Congressmen themselves, surely, want tax cuts and their interests don't really factor in the well-being of the country beyond what is applicable to them. I'm sure
how different each entity is to this is up for debate, but knowing how the GOP operates, it would be absurd to say they aren't doing this in large part to free up revenue for redistribution to the wealthy.
3. They need to deliver a 'win' to the elements of their party that actually want ObamaCare repealed. These people/organizations can't simply be ignored. The activists and various supporting organizations must be fed.
and more of an underlying theme: humans in general aren't really long-term thinkers. We can, and we do think long-term, but it's not the foundation of how things work in our heads. American culture really hasn't helped in this respect, either. Political polarization has also eroded some of the mechanisms which kept Congress from acting so terribly the past decade or more.
If I had to rate these 3 in order of importance, I'd say probably 2 -> 3 -> 1. I wonder if I'm forgetting a factor here, though.