The government likely wants to give local manufacturers an advantage even if it means not playing fair. I don't know if it's right but I understand why they do it (jobs & tax revenue).
On the subject matter, Tesla cars are a problem, they are too big and heavy for Europe. And European car makers should stop increasing their car sizes too.
You do realise that a battery is very heavy? Also, just because you don't want a bigger car, doesn't mean that others don't, there are still lost of smaller cars around.
Unfortunately, I can't comfortably sit in my current D-segment vehicle because I am taller than average (and there is no room in the back behind me), and any seating in buses or trains is even worse (not to mention airplanes).
So while I'd love to get the smallest car possible, I am a bit restricted if I want to actually fit my family in.
I want a small electric car for city driving though! My back will manage for short rides (I hope)!