No where is it written in our Constitution that the people have to support and fill the ranks of the military in a war that's considered unjust and immoral. No where is it written that people must give up their lives for failed foreign policies.
No where is it written that the people have to support a bad government who makes bad decisions.
You are wrong, it is all there in Article I, Sec. 8 of the US Constitution:
The Congress shall have power to lay and collect taxes, duties, imposts and excises, to pay the debts and provide for the common defense and general welfare of the United States; but all duties, imposts and excises shall be uniform throughout the United States;
To borrow money on the credit of the United States;
To regulate commerce with foreign nations, and among the several states, and with the Indian tribes;
To establish a uniform rule of naturalization, and uniform laws on the subject of bankruptcies throughout the United States;
To coin money, regulate the value thereof, and of foreign coin, and fix the standard of weights and measures;
To provide for the punishment of counterfeiting the securities and current coin of the United States;
To establish post offices and post roads;
To promote the progress of science and useful arts, by securing for limited times to authors and inventors the exclusive right to their respective writings and discoveries;
To constitute tribunals inferior to the Supreme Court;
To define and punish piracies and felonies committed on the high seas, and offenses against the law of nations;
To declare war, grant letters of marque and reprisal, and make rules concerning captures on land and water;
To raise and support armies, but no appropriation of money to that use shall be for a longer term than two years;
To provide and maintain a navy;
To make rules for the government and regulation of the land and naval forces;
To provide for calling forth the militia to execute the laws of the union, suppress insurrections and repel invasions;
To provide for organizing, arming, and disciplining, the militia, and for governing such part of them as may be employed in the service of the United States, reserving to the states respectively, the appointment of the officers,
and the authority of training the militia according to the discipline prescribed by Congress; SNIPPED
According to the US Supreme Court, every time a case about military drafts has arisen, Congress has wide latitude to pass such laws as are necessary to enable it to pcarry out its ennumerated powers. It is beyond all reasonable legal question that legislation instituting a draft for manpower for use by the military is within the operative language empowering the legislative branch.
If you want to change that fact of life, you are going to need a more specific amendment than the Thirteenth as the draft has never been legally or constitutionally equated to slavery in this country.