You cant stop a national government from making weapons and conducting war. A national government, however, should regulate corporations in its territory or sphere of influence to prevent attrocities and tragedies the corporations would conduct. You do not yet live in an idealic valley of plenty where there are corporations but not a government, so you must lend your voice; do you want one Tyranny Machine to run or should there be two Tyranny Machines and the second one has no oversight or regulation from the appropriate parties. Remember that when the government turns on its Tyranny Machine at least competing governments can oppose it. If you are not careful the Free Market Beast will allow many Tyranny Machines to run simultaneously.