The social justice diversity, equity and inclusion is a political stance that instead of seeing individuals see groups of "oppressed" and "oppressors" which is a recipe for a less productive work environment. These unchosen group identities are political tools and not descriptive of an individual.
Moreover, social justice uses activism to take over the organization to the point where it use as many resources as possible for activism. It is not unusual at this point for activist employees to ask a company to make bad business decisions for political reasons, so a policy putting political activism into the private sphere makes it clear that you are at work to create a long-term sustainable and healthy business.
