I don't know where you are implying they get their coal energy from. You can't get a contract like that. The electricity mix is roughly 50% renewables, 32% coal 9% gas, 7% nuclear power.
Aw shucks, guess we should throw away the whole program and give up on electric vehicles then.
Seriously, the first part of this problem would literally be fixed by the policy we are discussing in this thread (banning internal combustion engine cars). The second problem - green energy mix - is valid and also needs to be fixed. But using it as an excuse NOT to use electric vehicles is just a silly chicken-and-egg framing of the issue. We need both green energy and electric vehicles. We won't have sustainable transport until both happen, and it doesn't really matter which happens first.
In Berlin people love to cruise around with electric scooters, dreaming of a co2-free future and maybe present. Early at dawn the scooters are collected by some polish guys in a dirty diesel van and taken outside town where they are fixed and charged with electricity from burning coal.
The FDP doesn't hold anyone hostage, and society is in consensus (in terms of its revealed preferences) about continuing to burn coal, gas, and oil far into the foreseeable future, while expressing the opposite preference, and while making ICE engines and cars for the rest of the world as well.
EDIT: as someone who doesn't drive, hates cars, and has a carbon footprint one tenth of the average green party voter.