Re: Have you ever killed some innocent lives/animals,like a butterfly or a rat ？
Not 2B sarcastic, but anyone who eats meat arguably has in a "collective sense", by helping create a market for their flesh. Wearing fur coats, goose down parkas, etc also. Arguably, wearing leather belts and shoes is not, as leather is a byproduct of the cattle industry, and there aren't good alternatives that I know of. And yes, I know: most farm animals are only born to begin with 2B slaughtered later. (Or exploited for milk, eggs, etc).
My current avatar (new MP Karol Cariola of Chile) may well be the most beautiful Communist in the world.