My folks hosted a South Vietnamese refugee family...in a facility in Texas I think...sponsored through our church...
Nice family...mom, 2 boys & girls...house got busy...
Anyway, little girl had some issues...older sister married, kids etc doing fine...two boys smart as heck and married kids etc and pulling down big money in CA in tech companies...software engineers I think...mom passed some years ago...
Good, hard-working folks.
In my Navy days we were still fishing refugees fleeing communism off their makeshift rafts and sinking boats...by mid-80's all that needed to get out got out or were otherwise caught/trapped...
Neighbor at lake who passed away last year was a Navy pilot during the war, P-3's...went back there with some war buddies back in 90's...same reaction, people didn't hate Americans, just wanted to do their thing...were curious and polite...he went back several times, looking at old airfields and such...
Communism is communism...and corruption is everywhere for the upper echelon...and the people live under various degrees of authoritarianism...
Vietnamese are not constantly spied on because not enough people to do it and can't afford that much infrastructure & tech like China can...being in a backward part of the country in a communist nation is probably (if you have to be there at all) the safest spot to be in...