据理力争

to speak forcefully and with justice (idiom); to argue with the courage of one's convictions

to twist words and force logic (idiom); sophistry

in the right and self-confident (idiom); bold and confident with justice on one's side; to have the courage of one's convictions

to speak out for justice (idiom); to take a stand on a matter of principle

to try to make one's case using false arguments

(idiom) to speak forcibly out of a sense of righteousness