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.