First, he's barely a teen, second, he's got a ton of mental issues even before you factor in the ptsd that came from being unwillingly conscripted as a child soldier om a war against cosmic horrors by his own father, third, Misato is old enough to be his mother and then some, Rei is a literal clone of his biological mother, and Asuka is a terrifying mentally unstable psychopath pretending to be a teen girl child soldier. There's also a gay guy who has been the person who treated him the best so far, whoch mean not being a freaking creep out, and he's only doing it to groom him into giving him the chance to fuck him. The kid can't be blamed for anything he's doing bc he's just focused on not dying or going incurably mad. Lastly, the greater horror of what's going on only makes things go from being catastrophically bad to apocalyptically so. He's focused