In his memoir I, Asimov, Isaac Asimov wrote chapters about his contemporaries and apparently Heinlein was notorious for changing his political convictions based on who he was married to/sleeping with at the time. Hence, free-love hippie in Stranger in a Strange World and boot-licking war-hawk in Starship Troopers.
Sincere how? Heinlen was a raging liberal.
In his memoir I, Asimov, Isaac Asimov wrote chapters about his contemporaries and apparently Heinlein was notorious for changing his political convictions based on who he was married to/sleeping with at the time. Hence, free-love hippie in Stranger in a Strange World and boot-licking war-hawk in Starship Troopers.