Can you put out fire with fire?
On a literal level, yes. Others didn't agree with me. Would love to hear your opinion.
If someone sets a tree on fire with a small match and it is barely burning, then I come along with a flamethrower and burn the whole thing down. Did I arguably put out the fire with fire? I removed the tree with all of my fire, now there's nothing left to burn. I put out fire with fire.
Or think of it this way... If there is a flower growing, and I plant a small sapling next to it that grows into a tree. The flower would have died anyways when the winter came, but my tree grew large and made too much shade for the flower to survive. I killed plants with plants.