I will set aside the public transit time; I never use it myself. With all the waiting time and endless stops at every corner it is indeed a waste of life.
You are very judgmental and close minded. Also, a little short sighted. I read, text, daydream, talk with my friends, draw, listen to music on public transit. Waste of life? It is life. Sitting in a car, where I can't really dedicate much thought to a complex topic that isn't the road? That is a waste of life.
Another item which most people without homes or family are easily overlooking is that cars are necessary to transport essential cargo, such as food, materials, and everything else that a household may require. You need a car to transport things and people when your relatives need that help. Car is not simply a people's mover - it is a cargo mover. Rare is a day when I don't carry some cargo in my car that won't fit on a bicycle. Long gone are the careless days when all I needed to deliver was myself. Today I carry metal pieces, electronic equipment, wood, tools, and all kinds of stuff that I need every day. I will go and collect a UPS package in an hour or so; it is so large that it can't be conveniently transported on a bicycle. I will throw it into the car and that's all.
Again, you're stretching here. I regularly carry groceries and things that are essential on my bike. Things that are larger, I have a bike rig that I connect to the back. It's convenient, easy. It takes less time to get to and from the store than in a car.
I'm glad that you've decided that riding the bus and riding a bike are wastes of time for you. It's your life. I'm shaming you for deciding that everyone else who had chosen to do these things is making a poor use of their time.