Hitler is not even close to the same as Osama.
9/11 was not even close to the distruction in Pearl Harbor.
And if saving Jews was the justification for WWII then we did a pretty lame job of it because we refused to accept German's offer to take their Jews as immigrant and refused to take out the death camps even though we knew where they were located.
WWI too was mostly BS (in addition to becoming the cause of WWII) as the "war to end all wars" in response to the 'isolationists' (i.e. noninterventionalists)