It’s not that you need 500km every day, it’s that you need 500km often enough to make the average affordable ev with a 150km range impractical. Until there is a reliable charging infrastructure in place, people need a vehicle that can accommodate their longest trip, not their average trip.
Yes, we definitely need more trains, but the average person isn’t really in a position to build a rail network, so using the infrastructure currently available, cars are a necessity for most travel.