Ursula K Le Guin (October 21, 1929 – January 22, 2018)
Anger is a useful, perhaps indispensable tool in motivating resistance to injustice. But I think it is a weapon — a tool useful only in combat and self-defense…Anger points powerfully to the denial of rights, but the exercise of rights can’t live and thrive on anger. It lives and thrives on the dogged pursuit of justice.
Anger continued on past its usefulness becomes unjust, then dangerous. Nursed for its own sake, valued as an end in itself, it loses its goal. It fuels not positive activism but regression, obsession, vengeance, self-righteousness. Corrosive, it feeds off itself, destroying its host in the process.