he happened to be the one in office when the Civil Rights Act was passed here in the USA, so we ("progressives" in general) are expected to treat him like a Good Guy
he also started US involvement in the vietnam war because he was a huge anticommunist piece of shit
he got harassed daily by crowds of people outside the white house chanting "hey hey LBJ how many kids did you kill today" because of that
Yeah he certainly ramped up the war (he didn't want his brain splattered on a car like his predecessor) but yeah the US was actually involved since the french Indochina war