TL put wrong title on main page, completely different work that I'm pretty sure you also translate.
Anyway. I'm such a petty person thinking, I'd kill my family after I meet them again. Or am I? They quite literally abandoned him. I suppose from the logical standpoint, they couldn't save him. He seemed to be pinned under probably 1000+ pounds of building material. So either they've super human strength? Chop off whatever is stuck (seemed to be like 80% of his body, so no good) OR stay there waiting to suffocate/burn with him (dying together).
Definitely can't truly blame them for leaving you. However people aren't solely logical, they're emotional. My emotions are saying die you shit family for leaving me to die.
Worse still. They probably went to find help even though it's highly unlikely it would of arrived in time/made any difference based on the amount of flames pictured.