I agree. The point is that one's political orientation is not a simple choice no matter how radical. It may not be as fixed as sexual one, though, but still difficult to change.
It's kind of a water a person swims in. It's the way he thinks. It's too meta for most people to even think about it as something chooseable.
The idea is that you can believe whatever you want, but as soon as you start to propagate violence and pose an active threat against democracy - like e.g. making detailed plans to overthrow the government, advertising that only certain people should be allowed to vote, etc - there should be reasonable limits.