Yes, the Founders even saw the danger of the military operating on American soil so they wrote Posse Comitatus. Due to Caesar's refusal to disband his army prior to crossing the Rubicon. They weren't visionaries. Just students of history. Same applies to the 2A. They saw what happens when citizens are disarmed. Government oppression, time and time again. The 1A, well that's clear as day. Bill of Rights is basically all of the non-rights-rights that the Crown shit all over so were codified and immortalized in the constitution. The federal constitution used to only apply within the boundaries of DC. State constitutions controlling within states, no 14th Amendment crapping all over that. It is how we got McDonald v. Chicago (2A incorporated into 14th Amendment), but also how we got abominations such as Roe v. Wade and Obergefell v. Hodges (gay marriage). They're set to possibly incorporate the 5A Takings Clause into the 14th Amendment as well with a civil asset forfeiture case. The 14th Amendment is…meh. It kills federalism but it keeps rogue states like California, Illinois, New York, etc in check. Or….should.
Democracy is mob rule. Period. Founders abhorred mob rule. Agree it only works in small nation-states (Sweden is or used to be pure, don't know anymore).