I hate to quote pithy proverbs, but "the road to hell is paved with good intentions." One can have an altruistic goal which ends up harming people too, which is where that proverb comes from. Prohibition and The War on Drugs in the US are two good examples of something that had altruistic origins[†] but ended up doing way more harm than good.

[†] Another problem with altruism: we don't all agree on whether a goal is altruistic, and what's altruistic in the enactor's eyes might not be in yours. Curating a fountain of human knowledge like Wikipedia? Probably altruistic. Protecting humanity from itself by installing your company as the stewards of frontier LLMs? Not so altruistic in my view.