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If highly trained secret service officers accidentally shoot each other, a campus full of kids with guns would be ridiculous
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The problem with this statement is that even where CCW is unrestricted (like in Vermont), only a few percent ever choose to carry, and even fewer carry all the time.
For good reason... Carrying concealed is a lifestyle decision, not a choice of jewelry. Considering whether to carry on any given day's outing means taking on a lot of procedures and habits college students aren't accustomed to, and so it becomes a practical decision based on an assessment of the risk. If the assumed risk is low, most wont. As that perceived risk grows, more may decide it's worth the hassle.