He needs to stand strong for what he believes in.
That's the nice thing about a logical argument. Even if you're out yelled, out emotioned, fired from your job, etc. You know you are still right. Once someone is convinced by logic and reason, it is infinitely harder to get them to change their minds back. An emotional appeal no longer works. Anyone attempting to change someone's mind will have to offer facts. That's the best part of the 2nd Amendment fight; once someone is convinced due to reasoning backed up with factual evidence, they stay convinced. They may not have the nerve to stand up and defend it to others, but they still will support it in a voting booth alone.
Emailed him and got a letter of thanks.