Would the narrative that the US was fighting an unjust war in Vietnam

[OSR stands with Israel]

Surely, no. The fact that a lot of (American) lives were lost for a goal that was ultimately not successful, I think drives a lot more of that reaction than how unjust it was for the other side or how the US would benefit from it in the end, which wasn't really too much.

[OSR stands with Israel]

The United States did win the war. It successfully defended South Vietnam's independence for 15 years. Next they'll be saying the US lost the Afghanistan war even though the Taliban collapsed in weeks.

Btw despite the fact that going into Afghanistan was justified and going into Iraq turned out not to be , by pure military definitions the US won the war.