No, not liking some one's opinion is not valid reason for excluding them. You are supposed to include and exclude people based on whether you think their use of the trust system is valid or not. I don't remember saying death threats were acceptable, but please feel free to quote me.
A person's use of the trust system is usually based on them forming an opinion and taking the action they think is appropriate. Also, my quip about the death threats appears under a quote of another member, so it is not directed at you.