Might this quote I recently found also apply to the group you are mentioning?
Zeal without knowledge is always less useful and effective than informed zeal, and is very often dangerous!
-- St. Bernard of Clairvaux
Zeal without knowledge is always less useful and effective than informed zeal, and is very often dangerous! -- St. Bernard of Clairvaux
If I were emboldened to modify the great saint's words slightly I would not say that knowledge was lacking. A legalistic understanding of matters is evident. But, zeal without charity, zeal without understanding, zeal without maturity, and zeal without heart and spirituality is indeed dangerous.