So, you can't show me in the Constitution where it says that.
"I, _____, do solemnly swear (or affirm) that I will support and
defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; and that I will obey the orders of the President of the United States and the orders of the officers appointed over me, according to regulations and the Uniform Code of Military Justice. So help me God." (Title 10, US Code; Act of 5 May 1960 replacing the wording first adopted in 1789, with amendment effective 5 October 1962).
Oaths of Enlistment and Oaths of Office - U.S. Army Center of Military History
Oath
"I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state or sovereignty, of whom or which
I have heretofore been a subject or citizen; that I will support and defend the Constitution and laws of the United States of America against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I will bear arms on behalf of the United States when required by the law; that I will perform noncombatant service in the armed forces of the United States when required by the law; that I will perform work of national importance under civilian direction when required by the law; and that I take this obligation freely without any mental reservation or purpose of evasion; so help me God."
USCIS - Naturalization Oath of Allegiance to the United States of America
From the Declaration of Independence. Not only do you have the right to overthrow your government, it is a responsibility placed on us by a founding fathers. If our government betrays us, acts other then in accordance to our wishes or we feel changes need to be made it is our obligation to do so.
Declaration of Independence - Text Transcript
Now
Where are you from?
Do you know what a Tyrannical government is?