If you're writing an opinion piece, it's your job to write your opinion. If, on the other hand, you wrote a novel, as Virginia Woolf tells us, it would be inappropriate if you let your novel be influenced by your political opinions.
David Mamet"Based on a true story" is a come-on, the aesthetic equivalent of "no loan request refused." For, at best, the creator has fashioned a film based on his understanding of, interpretation of, and reduction of the report of an actual occurrence.
David Mamet