I've made the exact same rationalizations hundreds of times. My big one was that weeks start on Sunday so I'd always want to time my attempts at sobriety to start on Sunday, so hey I might as well get plastered on Saturday! But then I bought a calendar that showed the weeks starting on Monday so I had a brand new bag of excuses to use. It was never-ending the excuses my alcoholic mind could come up with to put off sobriety just one more day.
Glad you had this epiphany and thanks for sharing!