Because they had their own preconceived ideas about the Messiah, including that he would be a political messiah who would liberate them from Roman oppression. ( Read John 12: 34.)
لكِنَّهُمْ بَقُوا أَوْلِيَاءَ ،‏ وَنَالُوا ٱلْفَهْمَ ٱلصَّحِيحَ بِمُرُورِ ٱلْوَقْتِ .‏ —‏ لو ٢٤ :‏ ٢١‏ .‏