skyline

Fair enough but the head writer and showrunner does consider children to be the main audience, ironically he also wrote some of the darker episodes and my personal favourite "The Girl in the Fireplace". Two/Three decades ago children watched Animals of Farthing wood, Watership Down and even Plague Dogs (PG13) I don't think a dustbin on wheels is really pushing the boundaries.

Urban Hat€monger ?

This is true, but you also have to remember he's only one of 11 showrunners that the show has has during it's run. For example Phillip Hinchcliffe who ran the show during Tom Baker's early run said he would aim the show at intelligent 14 year olds & higher and that anyone younger shouldn't be watching it alone.

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skyline

This was in response to complaints about the show becoming too scary for kids, when Williams took over he was under strict instruction to tone it down. Hinchcliffe's rein was a controversial one, while he didn’t want to see it as a kids show everyone else was all too keen to enforce it as one, hence his disputes with the NVLA. This is far from typical for any of the other show runners, though I will concede a lot of the popularity Doctor Who gained was due to Hinchcliffe and how he treated the show.