I read somewhere another short story. A time traveler gets caught, disarmed, brought to an auditorium packed with other time travelers. Hitler comes in, and talks about how he just means good and why they are wanting to kill him. One insufficiently disarmed traveler takes a hidden gun, and shoots Hitler dead. One bodyguard then looks at the other one; "The people must not know this! What will we do?" "We have that body-double, but he's crazy..."