The point Dijkstra was trying to make is that humans are inherently incapable of dealing with that kind of detailed complexity, and still reliably make useful programs. That's why he proposed that goto should be excluded from all higher-level programming languages.
In my comment structured programming refers to using structured syntax to generate goto statements, so you don't have to see them or implement them yourself. It should free the programmer of considering those alternative ways of controlling program flow. Presence of goto statement points to a flaw in the language design.
To answer your question: Because the basic language I'm referring to, was on my TI84-plus calculator, and it only had an if-statement (no if-else!).