In the Federalist Papers, James Madison famously ruminated on the necessity of government.
“[W]hat is government itself, but the greatest of all reflections on human nature?” Madison asked rhetorically in Federalist No. 51. “If men were angels, no government would be necessary.”
It is because men are not angels (indeed, far from it) that we need the controls imposed by government. Even those laws that are overly restrictive and burdensome usually find their origins in the inability of citizens to do the right thing.