I saw the movie when it was theatrically released in 1967.I enjoyed it a lot.But when I saw it again on the telly a few years back,I asked myself:"How could I have come to like that?" I could say the same of all the Lelouch I saw when I was young.Those movies have become dated ,politically correct (with the exception of "la vie l'amour la mort" but it was Lelouch dutifully stepping into the shoes of André Cayatte),sometimes entertaining (le voyou:1970;la bonne année :1974),often so overlooong and pretentious they are almost unbearable (toute une vie:1974;les uns et les autres:1981).
"Vivre pour vivre" is still watchable,at a pinch ,for the actors (the best of the three leads is arguably Annie Girardot).The historical context (the Vietnam war) adds nothing to the psychological plot and dates the movie.