It isn't unavoidable, don't fire the damn missiles from the Drone.
The US and UK are like a little kid who fucks with a hornets nest, gets stung and retaliates by getting a flamethrower.
Fortunately weaponized lasers are coming. Those should succeed in reducing collateral damage almost entirely. All that needs fixing after that is the often-faulty intelligence, and weeding out gung-ho idiot drone operators.
(Very Very hypothetically) Russia annexes half of western Europe and starts massing troops on the border and deploying landing craft then you can open fire.
It's not very realistic purely because of the way the world currently works, as Von Clausewitz said "War is the continuation of diplomacy by other means" and it shouldn't be.
If that is true, then it's not "could have", it's "almost definitely will".
First responders and funerals are unavoidable collateral damage?
And that is all they are, excuses.
Should they each be charged with the same crime and receive the same punishment?