This fundamental right / privilege goes a long way in making the culture of the USA so appealing to a lot of people elsewhere. The thought process that went into making it so is evident here.
Consider the words spoken by Benjamin Franklin just before he appended his name to the most famous piece of parchment in American history. “I confess there are several parts of this Constitution which I do not at present approve,” Franklin said, “but I am not sure that I shall never approve them. For having lived long, I have experienced many instances of being obliged by better information, or fuller consideration, to change opinions even on important subjects, which I once thought right, but found to be otherwise.”