Starship Troopers The Pleasant Profession of Robert A. Heinlein, Farah Mendlesohn, Unbound, 2019, hardback £20 CHRISTOPHER G. NUTTALL reviews an unusually fair appraisal of a sci-fi pioneer “Over a period of twenty years, Heinlein’s attitudes had shifted noticeably. Were one to include the twenty years previous to that, the word would be ‘dramatically’. This was…