If you have a reason to carry, you have a reason to carry a backup.
Whether you want to or not is nobody's business but your own, as is your choice to carry any legal firearm.
No one has to have "someone out to get them" for a primary carry to be dislodged in a scuffle, or to have a primary jam or fail. The chances of that scenario are remote, but if it should happen, then the advantage of a backup is 100% ( whether it's called upon or not).
Bear in mind, just because your firearm is legally concealed but redily accessible does not mean that a predator can't spot it, just as most LEOs can spot it.
Just a survivors opinion.