Riding a push-bike is great for your fitness, but it's not feasible if you have a long distance to travel every day. That can be assisted by public transport, but that means you need reasonable public transport - being drenched in sweat, trying to squeeze a push-bike onto a completely packed peak-time train service isn't fun for anyone.
Motorcycles (and scooters) actually make a lot of sense, they are extremely efficient as a personal mode of transport, quick and great for travelling most distances. In many places around the world (particularly certain Asian countries) motorcycles are hugely common. I wish that were the case in western countries and that people actually took motorcycle rider safety seriously. The stigma is really "do it at your own risk", which is down-right ridiculous given I never sped, lane-split or did anything even remotely dangerous on my motorcycle. If I was going to die it was at the hands of someone else, someone whose thought-process never considered motorcycles as a legitimate means of transport, never expected them on the road, and frankly never looked out for them.
It's a shame, driving around a large 5 seat vehicle for 1 person is an enormous waste in most cases.