Can the player take the risks he wants or not?
That 1% is your arbitrary estimate on which you do not put any arguments.
So avoid giving numbers if they have no basis on which to rest.
If one tends to trade and run a crime empire (with rival gang fights and who knows what else), then that 1% could become 50%.
The point is that you cannot decide to prevent the player from being able to do something that is actually possible although inefficient or even wrong just because you don't like it.
I am not a dual wielding type and I know very well that going with two weapons against most warriors, without having the right techniques or the right protections means to die, not for this I am a priori against the introduction of this mechanic which if well balanced by the introduction of other mechanics (such as movement, step-dodge) can make the gameplay varied and more fun for the player.