I don't think it's helpful to be open minded, if you've already become truly convinced of something. I think it is good to stand firm in one's moral conviction

I don't think it's helpful to be open minded, if you've already become truly convinced of something. I think it is good to stand firm in one's moral convictions. It is also good to try to persuade others through debate of the truth if those convictions. If other people are not as clear or as firm in their own convictions, they might be interested in listening and being persuaded. It's part of America's constitution and freedom of speech and belief. Unlike France, for example, where religious speech in public (proselytizing) is an arrestable crime.