Because SQL looks and is more simple: plain English words that are easily recognized, with basic queries (select from) that can be taught in less than an hour and then build on it. Now let's look at SPARQL: everything screams at technicality. Curly braces (I'm not sure a non-programmer even know how to type this). Then the variable name prefixed by ?. Then the need to understand what is an URI and how and why prefixes are declared, not to mention the sheer fact of using URI instead of a simple names such as one found for database columns. But even that isn't enough knowledge to start writing the simpliest query. One also need to be taught about RDF triples.

So no, every query languages are not born the same. SPARQL is overly technical and requires a lot of knowledge to do even the simpliest things.