And this argument simplifies to "Might makes right", which is, I believe, an accurate assessment of what happened.
King George had the power necessary to win. What he lacked was the will to do so. So our great founding, rather than being a matter of principles in which we claim to believe, simply comes down to a matter of a lack of will power on the part of the British Chief executive.
Had Lincoln been in charge, we would all still be singing "God Save the King."
Tell it to Hitler and Tojo.
Many times, might is right, and IMHO, the Civil War which saved this nation and ended slavery was one of those times.