tidwell middle school student - aged 13 or 14 - started the blog in august .
it was called ` killing children ' and about ` me murdering people i hate '
stories named classmates and described either killing , maiming or sexually assaulting them .
the boy was taken out of school earlier this year and investigated .
he was allowed to return last month , with the school district saying the stories were ` horror fiction ' and not real .
local parents are outraged and staging protests outside the school .