[No park in New York City is nice or safe after dark. Because it is right across from the dorms, criminals probably know that the college kids go there after dark.]
It doesn’t matter how many armed or unarmed security guards they have, especially if they only stay on campus, and don’t, or aren’t allowed to make safety rounds off campus grounds in surrounding areas...like the park. I checked Barnard’s site, and they don’t have armed guards, and I also checked Columbia’s site, but they don’t provide info that they have armed guards...at least not that I could find. I see it’s only a three minute walk from Columbia to Barnard, but do we know if Columbia actually does any patrolling of Barnard’s campus?