Forum:"Human" shouldn't be capitalised

I call for a reversal of the language at Tardis:Manual of Style on the grounds that it was not, apparently, the house style of BBC Books to capitalize the word human. In The Tomorrow Windows, EarthWorld, Halflife, The Infinity Race and I'm sure more and more, the word goes uniformly uncapitalized, even when characters are speaking. What source ever gave us license to capitalize a word that the dictionary — and BBC Books — doesn't?