As much as I'd hate to defend Stephen Harper.... there is NO WAY he should be on that list. There are FAR MORE vile beings that have committed war atrocities in the last 100 years ... heck...the last 30 years... that should be put well in advance of Harper, who really is no more than a yes man to George Bush.
Hitler should be #1, unless you want to install Pol Pot or Stalin there... depending on how you look at things. Actually, the list should 'probably' read:
Stalin
Hitler
Pol Pot
After that, you can look at:
George Bush
Suddam Huessein
and whomever ever else has been at war in the last century.