Oldmarksman: I can see your point. I've carried OC, before. Just know its limitations as reasonable non-deadly force against assailants, who may or may not be able to close the distance and make contact with a deadly weapon, before you can 'beat feet'.
Depending on the circumstances, I do treat people whose hands are unaccounted for, with extreme caution, however. And, as I mentioned in the earlier post, reasonable fear of imminent threat of death or serious injury to one's self or a third party, is not evaluated from the perspective of 20/20 hindsight, e.g., from the fact of what the assailant 'actually' had in his pocket(s), but from the perspective of the defender, i.e., what the defender had reason to believe, at the time of the shoot. No need to further discuss this issue, not enough facts. But there's no doubt one would rather not have to have this argued in court, after an arrest, indictment, and the hiring of both a criminal defense attorney and a plaintiff's attorney (to sue the assailant/family).
OC instead of a BUG? Probably not. OC, in addition to a BUG? Maybe. Know your state/municipal laws regarding OC possession (as to capsacinoid content, and/or as to overall amount).
Asps/batons and knives are also alternatives, but those also require some research into their legality for concealed possession within the jurisdiction, not to mention the requirements of training to become proficient in their use.
BTW .... I've had plenty of encounters with homeless, belligerent drunks, and bat-poo crazy folk in my lifetime, and nearly all of them without serious incident or resort to the use of dangerous instrumentalities.
And I'm certainly not suggesting that because one decides to carry a BUG, and decides, further, to leave the spray out of his/her kit, that he/she is out looking for people to shoot when they don't comply with orders to keep their distance. Not enough facts, so I'm not going to generalize.
Do what you need to do to be prepared.