But the beefalo are the most helpful creatures in the game, why hirt the poor things?

I have one solo server and ive made it to about day 230 and only died once cuz the "idk what that is but im gonna attack it anyways" idea didnt work out for me vs the penguins. Ive killed multiple deerclops, beargers, hounds, mactusks, almost a queen bee, spider queens, and i died to penguins.