> In any Turing complete language, it is possible to write any computer program, so in a very rigorous sense nearly all programming languages are equally capable.
You seem to have more history on the matter than I do, so let me ask a question instead trying to defend that idea. Why did anyone think Structured Programming wouldn't be? They must have had reasons to suspect it. I also don't know much of the history of Structured Programming apart from "Goto Considered Harmful", so pointers would be great.