Was that sarcasm? Sure looks like it.
Sorry, but to rephrase the sentence, you definitely wouldn't say "We must blame he" . . . you would say "We must blame him"
You would not say "We must blame to him" -- which is what you are saying when you use "whom" in "Whom we must blame for Boston."
But let me ping Tax-chick, who knows more than I do.
Where did you come up with "to"?
Just kidding about the apology . . . besides did you see I used the wrong accept/except? Just seeing if you'd notice.
I'm still right though, so life goes on . . . besides, I teach English.