One post by @silence7 was a link to site on climate-friendly credit unions that don't invest in unethical things, and the other was a post by me on choosing to invest in ESG index funds that are verified by FossilFreeFunds.org due to normal banks investing your money into fossil fuels without your consent (I wasn't aware of the climate friendly credit unions when I made it).
Personally, I think it's fine to invest because, in a world with pensions being increasingly uncommon or defunded, it's realistically the only way to be able to retire, or survive while being out of work due to medical issues at old age without going bankrupt. Though I'm speaking mostly through the lens of living in the US.