This is a guitar which he painstakingly saved up for with a combination of pocket money & giving guitar lessons; he bought the parts, and put it together, and tuned/tweaked/toned it just so that it sounded just right.
So of course he is upset by the theft. I am sure he feels violated. I know I do. And my husband. That something like that can happen in a reputable university makes us angry. But then, this is the USA where crime happens probably more rampantly than what we have been used to in our sheltered lives.
As a parent, you want to shelter your child from adversity & turmoil. But it's not possible to do so, I know.
I am proud of how he has handled it, all on his own. He has kept a calm head, reporting it to the authorities, getting the help that he needs from faculty, staff & students. He is trying not to let his anger affect his behavior & attitude. He still has lessons & tests & performances & concerts to do which he will have to do with a borrowed instrument. I am sure he will still excel.
I am a proud parent.