Investing in an Index Fund

i think we're where we get into trouble, as if we say, that's the only proper and appropriate and obedient and god honoring way to invest. That seems to kind of cross over the line and get into this whole area of ind of conscience binding or ou. It gets almost ridiculous and you can go on and on and on... i'm not even sure I care about what company in my big index fund goes bankrupt. But if i end up owning a small portion of that firm? If i don't know it is wrong  then i just don't want to do it.