a reasonably experienced competitive shooter can draw from a holster and put two shots on target in ~1.25-1.5sec. racking a round while drawing would probably put it around 2-2.5sec. that 0.5-1sec advantage could make a pretty big difference.
Gun crimes tend to be ambushes rather than something that even remotely resembles a duel.
So every second counts?
Can't pull when someone randomly has the drop on you chambered or not. Have to retreat/conceal first anyways. Far more likely to have a tragic accident than ever saving someone. Not long ago someone accidentally shot the neighbor's house right into the bathroom. Accidents happen way more frequently than random crime and should be the top concern for gun owners.
Then why aren't the police constantly having accidents blowing holes in everything?
The police committing accidental/negligent discharges of their service weapons has been a nearly constant source of social unrest in the US... Great example of how people carrying loaded firearms is a public safety hazard.