As to why, you already know the answer. I don't know why you asked me the question, because you know me, and I'm pretty sure you know I would never be in favor of such a thing.
So, this is my answer to your question, but I'm really answering it for Bill. simply put, it's 'tit for tat'; partisan politics at it's worst. BOTH sides got us into this and have persisted in making a bad situation worse.
The Republicans in the House: (PARAPHRASED) If the Senate doesn't vote to de-fund the ACA we'll let a partial shutdown of the government happen!
The Democrats in the Senate: (PARAPHRASED) Oh yeah? Well go ahead, 'cause we won't vote to de-fund the ACA!
The Republicans in the House: (PARAPHRASED) Oh yeah? Well we're gonna do it and you're not gonna like it!
The Democrats in the Senate: (paraphrased) Oh yeah? you're not gonna like it either. Wait'll you see what WE do!
And they did, so they did......
So there's my answer, Bill. The legislative branch of our Government has devolved into a completely disfunctional Mob, and the President is totally ineffective at leading them out of this morass. I personally have no use for anyone that is a member of congress, or the President. I'm going to endure this crap until the next election and then vote against anyone on my ballot that is an incumbent.-Paul