We have a duty – we are obligated – we must – stand up for what is right, says Pope Leo XIII. The below is copied directly from https://www.traditioninaction.org/religious/n167_doctrine_2.htm:
Pope Leo XIII exhorted us in Sapientiae Christinae of January 10, 1890, to defend and proclaim the truth of the Catholic Faith at all times without fail. To safeguard the integrity of the Faith, he insists, is a duty that belongs to each one of the faithful and not just those with power of rule. Further, one who keeps silence in face of error is repulsive to God and unworthy of eternal salvation. These are important lessons for the progressivist clergy and laymen in our days.
Pope Leo XIII
But in the same matter, touching Christian Faith, there are other duties whose exact and religious observance necessary at all times in the interest of eternal salvation, become more especially so in these our days.
Amid such reckless and widespread folly of opinion it is, as we have said, the office of the Church to undertake the defense of truth and uproot errors from the mind, and this charge has to be at all times sacredly observed by her, seeing that the honor of God and the salvation of men are confided to her keeping.
But when necessity compels, not only those who are invested with power of rule are bound to safeguard the integrity of the Faith, but, as St. Thomas maintains, each one is under obligation to show forth his faith either to instruct and encourage others of the faithful or to repel the attacks of unbelievers.
To recoil before an enemy or to keep silence when from all sides such clamor is raised against truth, belongs to a man either devoid of character or one who entertains doubt as to the truth of what he professes to believe. In both cases such mode of behaving is shameful and is insulting to God, and both are incompatible with salvation of mankind. This kind of conduct is profitable only to the enemies of Faith, for nothing emboldens the wicked so greatly as the lack of courage on the part of the good.
Moreover, lack of vigor on the part of Christians is so much the more blameworthy, as not seldom little would be needed on their part to bring to naught false charges and refute erroneous opinions. And, by always exerting themselves more strenuously, they might count upon being successful.