It's not that she was a "critic of the conflict", it's that she was a treasonous communist who gave comfort to the Vietcong and encouraged them to torture decent Americans who would not pretend to be convinced by her anti-American speeches in Viet Nam. There's is an important difference.
the only poetic justice re Jane Fonda is that she is getting older and uglier!
To me, while agreeing 100% with you, it also may be that she did that INFAMOUS photo op climbing on the Soviet-made Anti-Aircraft Gun that had almost certainly shot at the fliers that the theater owner had trained!
The fact that the film had Jane Fonda portraying Nancy Reagan is sufficient, by itself, to demonstrate the biases presented in this movie. Stink, stank and SKUNK!