If you're truly convinced there's nefarious reasons for including megacap IPOs in passive index, you can always short the stock (or use derivatives) by the same amount.

I'm not sure you'll come out ahead. (Personally I don't get the outcry, except for nasdaq which has fairly stupid rules, delaying the inclusion of megacaps won't make the problem go away, but probably increase since the float will be massively larger). It's inherent to being a passive index.