Is it the weeds fault that its a weed? Perhaps not. Would it be a better living being if it didn't kill the other plant in the bargain? But then it wouldn't have fulfilled the job of a weed, would it now?
I don't feel great pulling out the weed. But it IS killing the other plant. One that was a vibrant red, and flourished merrily in the first few months is beginning to look more and more frail now. It's space being taken over by another being. Its water being absorbed before it can get to it. The rays of the sun being blocked by the tall stems of the weed. The parasite.
We simply plant the unwanted guest in another pot. The weed didn't choose to be a weed, after all.