Is publishing pictures or videos of Muslim girls being raped considered a violation of the honor of Muslims, and is the publisher considered sinful even if done with good intentions?

If the pictures show the 'awrah (private parts) of women, then it is not permissible to publish them, access them, or look at them. This is a grave abomination, and whoever does so is sinful, because he falls into the love of spreading indecency among the believers. What is happening to Muslims can be revealed through other means.