Oh but we do have studies, and they are not favorable to overreaching nanny state governments. They come in many forms, such as autocracies, democracies, theocracies, etc. The study of the overreach effect on constitutional republics is still ongoing however, due to the rarity of such forms of government making for a small sample size. Initial data suggests that governmental overreach in a constitutional republic has much the same effects as it does in other forms, although it is observed to be a longer and more complicated process depending on the will of the people to allow it to happen.
Autocracies, democracies, and theocracies have been proven to be hazardous to the health and well being of their respective citizens from data collected from the former Soviet Union, North Korea, Venezuela, Cuba, China, Afghanistan, Iran and many others. Long term effects on citizens include hanging, execution, genital mutilation, torture, imprisonment, starvation, lack of opportunity and a socio-economic class system, as well as severe limitations on inalienable rights such as free speech and association, illegal search and seizure, self defense, and equality under the law.
The study committee, backed with historical evidence, have come to the conclusion that all forms of government are like fire; they are useful and necessary, but very dangerous to life and property if they are allowed to get out of control.