That's not true. I climb alone quite often, but I also pick places where the risk is mitigated. Sure, things can happen but they can happen regardless. That being said, I wouldn't solo the bells because they are so loose. However, there are always people up there so it's rare you are truly alone. You make it sound like this happens all the time but that's just not true. The only exception is holy cross, for some reason people get lost up there all the time.