Sure, when you reach a point that you don't have better options to achieve the desired goal (for whatever metric you define as 'better') then killing is on the table by the sounds of it.
All we need now is an agreement on the threshold.
I'm assuming you'll concede that individual killing comes before mass killing, in the hierarchy of options.
So, once this threshold is reached then, according to your logic, you are morally allowed to kill in defence ( and i assume pre-emptive defence, given the "They are won by stopping the enemy‘s ability to act." statement ).
So going back to your original statement, it's entirely possible to kill an individual and still believe in your definition of 'believe in universal human rights.' ?
Provided the correct conditions are met, ofc.
Genuine question, what's the irony here ?