It's hard for people under the age of 50 to imagine just how terrible some bikes used to be. Even today's cheapest crap bikes are much, much better.
If the above photos don't do it justice, here's a personal anecdote. When I was in junior high, I had a Huffy 10-speed. The frame broke in half while I was riding it. The front downtube weld to the bottom bracket completely failed. Plus, steel rims, cheap-a$$ construction, brakes that barely worked even when properly adjusted, that kind of failure on a modern bike ridden only on the street and never crashed, would simply never happen.