We who believe in "good vs. evil" are always accused of wrongly seeing things as "black and white".
Decisions made 20 years ago to supply a nasty person with weapons have to be viewed in the context they were made in.
Was helping the Mujahedeen (sp.?) a bad idea because one of them grew up to be bin Laden? Well, to those of us alive and aware in 1980 the answer is a resounding "No". If you view this relationship outside the context of the Cold War then you are likely to have a different, and wrong, opinion.
Same with our relationship with Hussein's Iraq. If you were paying attention in 1979, you realize the menace Iran posed to that region.
No one with a realistic worldview expects to find lillywhite, pure as the wind driven snow actors to side withagainst a common enemy.
Oddly, the greatest and most tragic example of this was FDR and Stalin, an unholy alliance the Left seems to have forgotten.