[BluffTHIS!]

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Also, the fact that you can't make any more "bad" decisions on the river, where the equity extremes are obviously the greatest also makes this an easier play, IMO.

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Although this is an advantage when you are allin before the river and can't be bluffed out or forced to make a bad call when a scare card comes on the river, this isn't the case here because the bad card already came.

The fact is it is too easy to justify making bad money odds calls with reasoning like he might have only had two pair and is now representing the straight, when the more often case is that he is simply protecting his hand he just made (LAGs can be an exception). This is especially the case because most players with even bottom 2 would have checkraised the flop versus a preflop raiser. The action in the hand gives you the best reads ususally.

So all that being the case, even if the villain himself called the flop with inadequate odds to make a draw, once he has made it, are you always going to make a bigger mistake by calling with so few outs? In this case the hero supplied the implied odds to the villain, but the villain has nothing left to supply implied odds to hero for improving his hand. Thus the call can only be correct if hero could have such a good read that the majority of the time the villain would not have a straight. I don't believe this will be true though for the reasons I gave above.