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?

為什么賈斯汀·特魯多把食品價格上漲歸咎于雜貨店公司,而不是他自己的政策,為什么自由黨政客總是把他們的失敗歸咎于他人?