The Constitution was not perfect as written- nothing is, however at the time it was written it set a completely new paradigm, nothing like it had ever existed in history. Most people don’t understand how the world was at that time. Nobody had rights, your property and lives were NOT yours. They could be taken from you at any time for no reason at all other than the will of a ‘sovereign’.
There is a method to amend it the Constitution - obviously as it’s been done- for better (13th Amendment) or for the worse (16th, 17th, 18th Amendments). The Founders made this amendment process very arduous - for a reason. Remember at one time in history most humans in the world had a favorable view of slavery- a classic case of the 51% oppressing the 49%. Just because something is popular doesn’t mean it’s right. That’s why democracies ultimately fail- tyranny of the majority.
The Founders studied all previous forms of Gov and crafted ours based on the success and failures throughout history. It’s amazing how ignorant most individuals are of all of this background information, that is by design and largely why we find ourselves in our current situation.