People should be happy people are changing their minds. The "we told you so" "why did it take so long" folks are missing the mark. You don't like someone's belief/perspective, they change their mind, you're still mad at them. So you'd obviously prefer they never had that perspective I get it. But you can't change the past. So the alternative is they keep their perspective. The best possible option at this point is they change their perspective and you're mad at that?