[kosta50]

Alex, you are cherry picking out of a KJV version. Romans 13:3 reads:

"For rulers are not a cause of fear for good behavior, but for evil. Do you want to have no fear of authority? Do what is good and you will have praise from the same; " (Catholic NAB)

The good and the evil has to do with the subjects, not the authority.

[annalex]

Whatever the paraphrase, the passage describes a “prince” who is correctly distinguishing good from evil; what is good and what is evil is explained in terms of the Ten commandments later in the chapter. So, the implication is that if perchance a prince does not correctly differentiate good works from evil works (for example, legalizes murder), then that is not the prince St. Paul is talking about and naturally he is not to be obeyed.

Recall, for example, that Sts Peter and John refused to obey the Sanhedrin (Acts 4).