How do we know that the first eight amendments of the Bill of Rights are the most important protections for civil liberties today?

The first 8 amendments stated Criminal Prosecutions, and citizen's restrictions. (for the most part). These all were fair rights that essentially founded the standpoint for the laws of today. Since these were the first amendments. Congress had to get the important and obvious ones out of the way first. This means they are important to the US and it's way of function.