At last they will be back home, but they are sure that nobody could give them again that humanity that the war took away.

humanity 由词根 human（人类）加上名词后缀 -ity 构成，表示"人类特质"或"人性"。这个词特指人类特有的善良、同情、仁慈等品质，与战争带来的残酷形成对比。