No funding for the closing of Gitmo?

Today in an overwhelming vote of 90-6 the US senate denied Obama's request for funding to close Gitmo. The main argument was that senators (republican and democrat alike) wanted a better plan for what to do with the detainees. So this begs the question, why even close it in the first place? I understand that closing Gitmo is symbolic and that we're trying to appease the rest of the world in doing so, but what's the point? Why not just leave it open, leave the detainees there and not have to solve a manufactured problem. Furthermore, why in the hell are my tax dollars going to a dog and pony show to simply show the rest of the world we aren't going to torture terrorist suspects anymore. Can't we just stop doing it and have that be enough?