I guess we just have to disagree.
I have been "fortunate" to travel a bit in a "thirld world", seeing a mother, with a baby, living in a wooden shack, no water, no electricity, mother having AIDS, dying slowly.
I did not know what to do, except buying some food and milk for the baby. Few years ago, don't know what happened to them.
So sorry, "Founding Fathers" and "moral obligation" are not efficient soundbites to me.
They are not "sound bites".
And you still haven't shown where any government has the right to "force people to be charitable". It sure isn't in the Constitution of the United States.
See, the problem here is, you, and those like you, want to tell everyone what "charitable causes" they MUST give THEIR Money to. You feel YOUR right to make that decision supersedes OUR right to make that decision. Which means you feel you are morally superior. The rest of us take serious exception to that.
If YOU want to give to the charity of YOUR choice, I'm fine with that. In fact, I'm GLAD you feel strongly enough and are willing to back those feelings with YOUR money. However, that DOES NOT entitle YOU to decide what charity I spend MY MONEY on. See I give my money to places like the MDA, or St Judes, or my local church. And it is MY money, to give to whom I see fit. It is NOT YOUR money, nor is it the government's money, to give to whom YOU see fit.