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They have a lower emissions after a few years even with higher initial manufacturing emissions even in areas with coal as the source of power, just takes longer to recoup. https://youtu.be/6RhtiPefVzM?si=ythLgdv93D6zC3WM
They allow for government to control the means of electricity production that powers these vehicles
While not perfect it is a decent step to remove the individual citizen's direct pollution and leave control In the hands of government. This is where the change needs to happen for manufacturing and other large scale polluters.
On the second part: That's just because for some reason most governments don't care that it would be much more profitable to everyone if state corporations took care of petrol exploitation instead of private companies that profit few investors...