I have no problem with the sale of medical debt--what's needed is sanity in the debt collection business. Combined with making one-party record the law of the land--you're automatically free to record telephone calls without notice.
Bill forgiveness as charity? No, that's counting twice. They didn't collect the debt in the first place, there is no profit to be taxed and thus you are deducting $0.
ER: Two problems here.
ERs are mandated to stabilize a patient, urgent cares are not. Thus you see people in ERs with situations that could be handled in an urgent care because the urgent care rejects them for unpaid bills. And the ER can't provide those services just as cheap--a big part of what you're paying for in the ER is potential even if it's not actually used. The freestanding radiologist books their machines as solid as can be done without too much friction. The ER needs the same machines but needs them available NOW. I've been in an urgent care over a kidney stone--they had a CAT manned and ready to go at 3am (the only urgent care in town even open at those hours even before you consider the machines--every ER needs those machines 24/7.) CATs don't cost much to run, the main cost is the machine and personnel time (operator and radiologist) and that's incurred whether it's doing anything useful or not. (And then the urgent care punted anyway. Yeah, you're right, stone, we can't deal with it, go over to the ER.)
I will also say that transport isn't always as simple as you make it out to be. Consider that stone I just mentioned--the ER was half a mile away, trivial under normal conditions. Even under those conditions I could have *slowly* walked it--except there was a major street in the way and I most definitely did not want to cross that. Is a taxi going to take the call? No. Call a friend/rideshare/ambulance.