No, people should be accountable for their opinions as well - you can't simply say that black people are stupid (in the John Derbyshire example) and expect that people won't get mad at you.
People might get mad at you. The board of directors might decide you're an embarrassment to the company, and golden-parachute you. But to impose some kind of angelic, super-human behavior requirements for top business leaders seems a bit naive. Quite a few of these hard charging types who made it to the top tend to have, shall we say, unpleasant personalities.
This is sort of a nit-pick, and also something I think is an important distinction. It's definitely aside from the point.
But that tree was tolerant at the end. That is exactly what tolerance means. Thats a very important distinction to me, because while it's all the law or government can ask of people, it misses the point that we are supposed to love our neighbors. The tree didn't open it's heart to people of different races, it didn't realize that the world is better when we love each other. All it did was tolerate.