Electric cars are generally more efficient and they cut down on localized pollution meaning they're generally better for the people living around where they're operating, but in terms of big-picture shit they are indeed basically meaningless because commuter cars make up such a tiny portion of overall greenhouse gas emissions and industrial pollution. Industry, agriculture, and logistics for raw materials and finished goods accounts for an overwhelming amount of greenhouse gas emissions and pollution in general.

Electric vehicles certainly would be better than internal combustion engine ones, and one could certainly imagine they'd still have a place for last-mile logistics and some transportation even with a transport system reworked to favor mass-transit and rail logistics over cars and trucks, but they're completely meaningless on their own and the whole "jUsT bUy ElEcTrIc CaRs" shit is just another facet of the liberal consumption-as-the-only-acceptable-form-of-political-activity shit that seems to atomize everyone and turn every issue into an individual subjective moral choice rather than something that needs to be addressed systemically.