Subsidizing sales of EVs (ie. I pay for my neighbor's new EV because I want cleaner air) does make environmental sense.

Subsidizing production does not have the same positive environmental impact, mainly because factories in China pollute more than factories, say, in the EU (due to different environmental laws), but also because moving finished products from China to the "west" obviously pollutes more than moving just those components that would need to be sourced from China anyways (eg. batteries).

As for the "makes economic sense" part... IDK: I guess that mainly depend on your political stance.
Personally, I don't like that both sales and production subsidies have the effect of moving money from the poor to the rich, but other people may focus on different effects (eg. more production = more jobs) and support subsides.
In case you wonder: my take is that, instead of incentivizing adoption and production of EVs, one should disincentivize internal combustion vehicles by adding taxes to them (which, in a sense, aren't really taxes but just charging for the very real environmental costs society as a whole will have to pay for your shiny SUV).

Anyone not doing this is an idiot and a climate terrorist.

You should really think twice before spewing judgements... and also avoid misusing words like "terrorist" because, when misused this way, it only conveys that you don't like someone, dulling your message instead of strengthening it.