If you want to look at it that way, you also should include the emissions/environment impact included in acquiring the oil, building refineries, the emissions during the refinery process, and the shipment of the fuel around the country.Yes, we should.
As I said, so far it looks like the jury is still out. The problem with many of these reports, including much of last week's commentary on the study I mentioned and also including the source you linked to in the parent comment, is that the popular summaries are often light on key details so it's hard to make meaningful like-for-like comparisons based on the available reporting alone. And so far, it has often been remarkably difficult to track down and evaluate the primary sources behind a lot of these reports, on both sides.
It's also worth observing that some of these claims aren't necessarily contradictory. It's certainly conceivable (without seeing more data to confirm either way) that the average petrol/diesel vehicle in the US is relatively big and inefficient compared to those in say Europe or Japan. Meanwhile, the environmental impact of an EV is going to depend on how environmentally friendly the energy supplies ultimately used for charging are, which apparently varies dramatically across the US based on your linked source, and presumably varies elsewhere as well.
If our national power grids and/or local microgeneration facilities at homes and offices continue to move towards more environmentally friendly sources, and if the environmental costs of the batteries do not increase significantly as more EVs are produced, then it seems reasonable to assume that at some point it would become more environmentally friendly in terms of emissions to use EVs. So far, I see a lot of loaded arguments and cherry-picking from both sides of the debate, which makes it difficult to know whether we have yet passed that point in any given set of circumstances.
