The only sounds logic is keeping the deal in place. Most scientist applaud this deal. Is it perfect? Hell no. But if Iran wants the nuke they are going to get it either way... But (before you twist my words), at least with this in place there is something to prevent them and they are making an effort as well. Doing nothing would be the only crime. Plus what would all of European allies think if we just rejected this deal after going in on it with them? I don't think they would take us seriously moving forward.