why teachers avoid students' questions

link from an irish paper.

Recently a young child I know had an experience that significantly upset him. In school one day he had asked his teacher what the idea was behind the Christmas tree, and how one could ‘rebuild’ a dead tree with lights and decorations as we see on the streets and in homes throughout the country.

http://www.metroeireann.com/article/whats-wrong-with-asking-questions,2264