Sure, but that is the users choice when they chose to use a particular list. I think it is better to give someone the option to choose which people or classes o

Sure, but that is the users choice when they chose to use a particular list. I think it is better to give someone the option to choose which people or classes of people to block than decide for them. If someone thinks the risk of blocking someone they are interested in is outweighed by the cost of being exposed to people who's opinions they find damaging, that is their choice. Personally I wouldn't really block anyone, but I think it is better to have the option that to not.