What was Roosevelt warning against in the sentences?

I hail as a benefactor every writer or speaker every man who on the platform or in book magazine or newspaper with merciless severity makes such attack provided always that he in his turn remembers that the attack is of use only if it is absolutely truthful.

A. Falsely accusing people of evil practices

B. Writing too passionately on certain topics

C. Telling the truth will lead to retaliation

D. Forgetting that journalism is very powerful