...The OSS was running around killing Vietnamese during WWII?
If they helped the Japs, yes.
For all their brutality, the Japs were welcomed in many places as liberators through much of the early part of the war. The Europeans long wore out their welcome for their colonial excesses.
But, war is war, and while the Vietnamese had no desire to return being ruled by the French many were aiding the Japanese by default, so, out they went.
I think we had every right to work towards thwarting the Japanese and every right to keep Vietnam from becoming a Soviet client state but why on Earth we did it in the name of French colonialism is beyond me. I would have pushed past the USSR and offered to arm Ho Chi Minhime against the arrogant, racist, brutal froggy ****s myself.
The French have never been anyone's ally. The only reason for invading Normandy was because it was full of Germans, not to liberate France; which never granted the privilege to anyone else and doesn't knwo what to do with the gift of liberty for itself.