First aspect: They are wrong from the viewpoint of truth.
O unjust one who nourishes rancor and enmity for a believer, imagine yourself on a ship or in a house with one criminal and nine innocent persons. If someone tried to make the ship sink or set the house on fire (because of that one criminal), you would understand the magnitude of such an injustice and protest and decry his injustice as loudly as you could. Even if there were one innocent person and nine criminals on that ship, it would still be unjust to sink it.
A believer may be compared to a house or a ship belonging to God. Such a person has not nine, but as many as twenty innocent attributes such as belief, Islam, and neighborliness. If you cherish rancor and enmity for him (or her) because of one criminal attribute you do not like, which means desiring the destruction of that ship or house, your crime would be most atrocious.
Bediuzzaman Said Nursi