My answer - they're to blame if they pulled the trigger - or conspired to have the trigger pulled.
Otherwise, they're free to hold and express their opinion - at least for now. And hopefully that will always be true. If people aren't free to express opinions that others disagree with then we no longer have freedom of speech. The whole point of "free speech" is to be able to do just that. There's no need for the government to protect the right to express popular opinions.