Non-Masonic conduct, What do you do?

After being in the craft for almost 2 years now It has become dear to my heart. I see some people wanting to join for obviously the wrong reasons.

Their actions as a man may make many masons shutter. If you see someone that maybe pledging in another lodge that you know is not in it for the right reasons or their personal actions in real life to yourself and to others is out right despicable. What do you do?

What happens if their actions continue after they are a brother. I have seen and heard from 2 people who are hot heads and have admitted to wanting to be in it for the wrong reasons. If masonry helps them improve their personal traits and make them a better man then I am all for it but what happens if they continue to be not so level?