Don't blame the bra holster, blame her obvious neglect for safety on the firearm.
As long as the safety is on, there's really no good reason why you would accidentally discharge it.
Not to mention most pistols now have 3 safeties. One on the trigger, one on the handle, and one manual one (some dont have this one now due to the other two) Plus it needs to be roostered before fired.
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To add a serious answer to this, having a bra holster is better than having it in the purse. Self defense and everything.
Plus you act like something like a pistol is some sort of big deal. It not like its a bra holster for a rifle. A pistol is perfectly reasonable to keep on a person.