it was pretty much assumed the guy was just a bad speller and thought killing vietnamese children was a good idea.
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The bad speller part is almost certainly true. Few people wish to murder any sort of fabric.
WHY he thought killing Vietnamese children was a proper response to wishing to "kill Satan" (or satin) was something that could be found out only by interviewing him, probably by someone trained in psycopathic behavior. I can imagine Satan wearing shiny red satin more easily than wearing terrycloth, a gauze tutu or Clan McDonald tartan, come to think of it. Satan is often shown as being shiny and red.