Conversation so far:
What happened with Robert A. Heinlein in 1959?
Robert A. Heinlein ended his juvenile novels with Starship Troopers (1959), a controversial work and his personal riposte to leftists calling for President Dwight D. Eisenhower to stop nuclear testing

Question: why was it controversial?
Self-contained rewrite: Why was Robert A. Heinlein's Starship Troopers (1959) controversial?