Many of those large investors are mutual funds and pension funds. Some of which do fund widows and orphans. E.g. I think CALPERS was involved in one of the lawsuits?
Stealing a penny each from a million people surely must be just as evil bad and wrong as stealing a million pennies from one person (any sensible way of relating money and harm comes up with that result). I think the reason it seems less bad is that our monkey brains aren't good at comprehending the concept of millions of people, so when we say "a million people" our moral intuition just interpreters that as "lots of people", i.e. "a couple of hundred people".