The semi-inevitable downvotes may be because xkcd links are seen as cheap canned injects that although relevant and often funny don't really add anything novel

The semi-inevitable downvotes may be because xkcd links are seen as cheap canned injects that although relevant and often funny don't really add anything novel to a debate. And perhaps - the horror! - they might not actually always be correct in a specific case. Disclaimer: I really love xkcd.