Sowell says

Activism is a way for useless people to feel important, even if the consequences of their activism are counterproductive for those they claim to be helping and damaging to the fabric of society as a whole.

— Thomas Sowell Quotes (@ThomasSowell) November 2, 2019

This is not always the case.

Vigorous campaigning can bring about positive political or social change.

But it can at times be a case of doing something rather than doing something positive and effective and it can sometimes be doing something that does more harm than good.