While it is reasonable what you conclude in opinion (of which I tend to agree), it is a far stretch to claim so narrow a purpose of residential zoning.  Because, it is more likely than not that the original and succeeding authorities of the zoning code didn't have this vexing modern day torment in mind at the time.  It would be like presuming insight upon the original designers of Honolulu's freeway.   So, to presume your indignance as the zoning framers' purposeful intent is too premature without grounding in facts when making a public comment.