Since when was that the case? The "people dispensing justice" are judges - and separation of powers takes away the interest of the judiciary from being minded in advancing politics, ideology, and 'movements'.
The "people dispensing justice" have no business in the politics of their day -- their business is strictly concerned with law and evidence, not the fashionable ideology of a particular era - especially in the originalist and constitutional context. Any attempt by "the people dispensing justice" intentionally to advance a cause is malpractice and an abuse of process, not sound law.
It is especially worse now that the 'people defining injustice' are now being asked to jump to conclusions and assign culpability upon sand - i.e. upon allegations, rather than upon evidence. That is not the legal system of America that we know of.