in justification of
为…辩解as a defence for sth
In justification of his conduct he pleaded that he was merely obeying orders.他为自己的行为辩解说,他仅是在遵照命令行事。

I can see no justification for dividing the company into smaller units.我认为没有理由把公司划分成小单位。
We have sound justification for what we do.人们对自己所做的事都会有辩解的理由。