Leftists do justify every tactic they use by asking “do the ends justify the means”.
Now, for a while, I thought, there has to be some “means” that they would say wouldn’t be justified... BUT
then I read “You can still trust the communists to be communists” and figured out why ANY means is justified.
They define the “ends” as pretty much heaven on earth - absolute perfection.
So, sure, it’s OK to kill half the population, as long as the remaining population lives in a perfect world.
Don’t laugh. I had a well educated friend that thought it would be wonderful if about 75% of the earth’s populace would simply cease to exist. He was THAT wigged out on environmentalism.