I would be upset if they outlawed driving because someone died in an accident.
Speeding, DUIs, reckless driving, etc. (the things that cause automobile accidents and most automobile deaths) are all outlawed!
I would be upset if they outlawed alcohol because someone died of alcohol poisoning
There are heavy regulations/taxes on alcohol sales and possession to prevent people from dying.
I would be upset if I wasn’t able to own a dog because one time somewhere someone’s dog killed a person.
It's illegal for your dog to kill a person (felony manslaughter, actually).
Rules are put in place to prevent avoidable deaths in every aspect of society. You've made a false equivalency here. If your examples were all comparable to what OSU has done with Mirror Lake, then OSU would have outlawed lakes on campus because somebody died in a lake. They didn't. You just can't jump in the lakes en masse now because that's how people die.