I am a citizen of the United States of America, and I rely upon the foundational documents that established our government. These documents describe the powers granted to our government, and to each branch of our government, and to each officer of our government, including the President. These foundational documents outline the limitations that apply to governmental actions.
A decision that the United States government should go kill people in other countries cannot properly be taken without a PUBLIC ARGUMENT (however "good" or "bad"), carried out by the elected representatives of the people of the United States of America, in Congress assembled.
That's what the Constitution says, in Article I, Section 8. It is the Congress that has the power to declare war. Without Congressional authorization, no person, including any President, is given the right to go kill people in other countries.
And if our current President does that...
More than shame on him!
The people who established the foundational rules that limit the conduct and actions of our government must not let illegitimate actions stand.
Easy to say, I know, but I do not grant to any person, including any President, the right to go kill people in other countries, and to do it in my name.
Not without a public argument first. Not without a declaration of war.