Thought of a great analogy for the "I meant to taser" argument - officers drill regularly on weapon usage. Taser is worn on "non-dominant" side, gun on dominant side. You drill. You train. You make it second nature to reach with the proper hand.
Imagine you *always* put your phone in your right pocket, and your keys in your left.
It's late at night, someone's following you. You approach your car. Do you reach for your phone when you mean to get your keys to open your car door?
No.