Ask yourself this question. What is the President least likely to know already. You can bet he's at least familiar with the changes in the law, because he has to prepare for the creation of new rules. So, you can cut out anything having to do with the law other than a cursory "with the upcoming changes in the law, I wanted to give you some things to think about". Then think about what is he least likely to know that might arrest his attention. For example, "did you know that licensed Texas gun owners are 17 times less likely to commit any crime than the average citizen?" BTW, CHL holders are not "some of the most law-abiding". They are BY FAR the most law-abiding - even more law abiding than law enforcement. Don't water down the important points and don't be afraid to highlight the positives. For example, "are you aware that Colorado State University has allowed concealed carry on campus since 2003 and has not had a single incident in the past 12 years involving a licensed carrier?" Rather than citing multiple examples of positive incidents with concealed carriers, tell him you'd be happy to share those with him in a meeting, if he desires to hear them. Rather than citing multiple incidents where a concealed carrier might have change the outcome of a shooting, point out that the first few moments of a serious incident are the most critical, and those are the same moments when the police are not on the scene.
You want the letter to be brief, extremely hard hitting and to the point. Otherwise he'll likely not read the whole thing and you'll lose your opportunity to gain his ear.
Something like this:
Dear Dr. Smatresk. I'm sure with the recent changes in Texas law regarding campus carry, that you have begun considering carefully how UNT will comply while maintaining a safe campus. Therefore, I wanted to give you my input for consideration as a licensed carrier. I don't know if you are aware of it, but Texas licensed carriers have an admirable record in the 20 years since the law was first passed. In fact, according to DPS statistics, they are 17 times less likely to commit any crime than every other citizen in the state. Their record is so admirable that it's even better than Texas law enforcement!
There is evidence that you can access that should give you some comfort when considering where on campus carrying should be allowed. Colorado State University has allowed campus carry since 2003, and to date they have not had a single incident involving a licensed carrier. Colorado, Utah and Idaho have all allowed campus carry for years, and none of the campuses have ever had an incident involving a licensed carrier.
I would be happy to discuss with you other statistics that argue that allowing campus carry will contribute to a safer environment at UNT.
Cordially, John Doe