AIDES SAY U,S. ERRED ON MOOD OF SOVIET
Members of Sec Vance's delegation and others suggest Carter Adm apparently miscalculated mood and intentions of Soviet leaders before and during his trip to Moscow, and that this contributed to US reaction of surprise when USSR rejected US arms limitation proposals; note Carter did not lake seriously warnings by Brezhnev and paid little attention to groundwork laid earlier by Sec Kissinger and Brezhnev; key factors in Soviet rejection seen lack of meaningful restraint on US cruise missile and resentment over Carter's public discussions of proposals before presenting them to USSR; White House also did not take seriously warnings by Russians and Amer Embassy in Moscow that Carter actions on human rights were creating poor mood for talks; Vance flies from London to Paris to brief Pres Giscard d'Estaing (M)