It is not a guess. Hitler offered peace multiple times. Even offered to leave Poland if Danzig were allowed to come back to Germany. All rejected by the governments of UK (N. Chamberlain was pressured by Roosevelt and the warmonger group around Churchill) and France.
Ever heard of the "Phoney War" en.wikipedia.org/wiki/Phoney_War
After UK and France declared war on Germany UK shortly bombed northern Germany and France shortly invaded western Germany. Germany did not retaliate for several months.
Only when UK and France threatened to invade Norway and Benelux Germany was forced to occupy these countries.
UFOs are real
4 Hour Witness DVD (radar operators, pilots, scientists, military)
Part 1: http://www.youtube.com/watch?v=ud49Gh9yYLs
Part 2: http://www.youtube.com/watch?v=kpHAxxRKksQ