Richard, it is not my assertion, it is the position taken by the US government.

"Reinhard Heydrich was one of the key architects of Hitler's genocide against the Jews.

In 1941, the British Special Operations Executive (SOE) was authorised by Winston Churchill to assassinate high-ranking Nazis wherever they could be found.
In 1942, two of the many Czech citizens whom the SOE had trained to implement this strategy blew up the car carrying Heydrich to his office in Prague. He died a week later from infection following his injuries.

If that had taken place today, we would most likely find the Archbishop of Canterbury fretting 'justice didn't seem to be done', Paddy Ashdown tut-tutting that the rule of law did not condone 'non- judicial execution', and human rights lawyers seeking to arrest Churchill for war crimes"