You got the bridge troll correct. I have to disagree with your comment that

"but trying to think of solutions seems more productive than coming up with reasons why possible solutions won't work"

In the Sherlock Holmes novels he says Once you limit the impossible the remaining choice is correct no matter how improbable. Not an exact quote but since we do not have the resources to pursue every available option it remains for us to eliminate the wrong and the unlikely so we may better ascertain what is the best answer. It boggles my mind when supporters of a topis no matter how well intentioned seem to beleive there is a never ending supply of Government money to spend on their chosen goal. The government has no money they spend our money, at least those of us who pay taxes. I say if you want to donate the shirt of Your Back for a cause you are indeed a good sould but when you persist in trying to donate the shirt off my back you are a thief. (that is meant as a general comment no aspersions are directed at your specific person)