gratuitous

A few months ago I came across this adjective in the international news pages of my local paper. It was used in the context of needless and wanton violence perpetrated by a state on its citizens.

In work contexts it can be applied to behaviours, actions and attitudes that are unjustified and unwarranted. 

If you are going to use gratuitous in this context, be able to back up your statements and observations with evidence.