Why is Justin trudeau blaming grocery store corporations for rising food prices and not his own policies, why do Liberal politicians always blame others for their failures?

为什么贾斯汀·特鲁多把食品价格上涨归咎于杂货店公司,而不是他自己的政策,为什么自由党政客总是把他们的失败归咎于他人?