For the last 40-50 years people have been misled into believing we should eat so called healthy carbs at the expense of normal healthy fats, so I consider it unreasonable to assume that we have caused our diabetes by our lifestyle choices. The so called dietary "experts" actually have a lot to answer for.
My T2 was inflicted on me in part by long term consumption of statins, so definitely no lifestyle choice of mine, neither was a high carb diet my preference. T2 enabled me to justify a return to a better way of eating, so choosing LCFH was an obvious and easy choice to make, and one that I can continue with long term.