Electric cars increase the numbers of people on the road, surely that isn’t a good thing?

We’re not really sure how this argument comes about but giving companies like Tesla are pushing for Autonomous Ride Sharing schemes we cannot see how there will be more cars on the roads, as you won’t need to own a car anymore, you can simply rent one by the minute/hour/day etc and it will arrive to collect you and drive you to your destination, what will happen is that individual cars will get used more and have less dwell/idle time, because when you’re not using the car it can be out working for you.