It's not really amnesia so much as it's that there are absolutely no consequences for being absolutely full of shit. Nobody ever really gets called on it, certainly not by people on their "side". So why not just repeat every unsubstantiated thing you hear and see what sticks? If it turns out you're wrong, no need to even apologize, just move on to the next thing. I give the OP some credit for prefacing a totally unsubstantiated, fairly suspicious story with "consider the source", which is notable mainly because you hardly ever see that sort of thing.
You note I didn't once mention "Obama this or that", right? The problem is that while the veracity of the story is in doubt, the significance of it is not. I'd also suggest that the piece I posted is unverified by official statements and so is the one that is cited as repudiation. Frankly I hope that the second is true, but both remain unverified. As that is the case what grounds does the poster you quoted have in fact to render a statement of condemnation or vindication other than "whack a mole"?
Perhaps its the fact that anything brought up which does not reflect positively at the start on how things were handled were at issue. I don't see much objectivity in declaring the "the other side" wrong. Worse, the ingrained concept of having to have a side promotes foolishness in otherwise intelligent people.
Pick a side if you must, and that goes for left or right, but please do so based on something more than political favoritism.