I think it's fair to say mass adoption of automobiles was viewed progressively in that time period. Certainly not by all, but by many. It was a new disruptive technology that allowed you to move people and things in a cost efficient way that previously wasn't possible. When your only option for public transit required an upfront investment in fixed rail lines, and then a cheap comfortable bus with rubber wheels and adjustable routes comes along, it seems like a huge innovation.
Also from the article:
"A widespread misconception exists that well-functioning streetcar systems were intentionally put out of business by a conspiratorial alliance of tire and auto manufacturers in the 1940s and 1950s…In reality, many streetcar companies were never reliably profitable, and they suffered from overcapitalization, inadequate maintenance, and poor service". In comparison to that, all these cheap and reliable "rubber tires" vehicles probably seemed pretty progressive.
Of course, knowing what we know now, it's easy to see how incredibly short sighted this was. I sure wish we hadn't ripped out all those rail lines.