Your vote, your choice. Their content, their choice. I myself do not like any blacklist, they only cause problems. If people want to follow and use your list, their choice. If people want to down vote, up vote, mute, or ignore those on your list, their choice.
I see a lot of peoples comments are unhappy with you simply stating your opinion, and what your actions may be in the future. I does not matter that you are a witness or not, but people seem to think it does, it is your call on how you use your vote. You could have just not made the list public, but you did, so people could see and so you could be transparent in your actions.
Transparency is needed more. No one on that list will wonder now why they got a down vote from you. It is one down vote. You have 2461 accounts on that list, a very expensive list to down vote if they should all dual post.
Perhaps one day we will see the down vote system reworked and that the peoples voice will be heard in regards to down votes, until then we have what we have, there seems to be no desire to allow for the peoples voice to be heard when it comes to down votes. It is pretty much a one way action, and that the individual receiving, and the people that see the down vote have no option to counter that down vote other than with an up vote. The blind down votes will continue, the down vote only accounts will continue, and the cost will continue to rise in user retention.
I will continue to up vote the post of those I follow on steem that do post until such time as my power down is complete. So their post may get a small down vote from you on hive, they will get a dwindling up vote from me on steem, balance achieved, one down vote, one up vote, the values may differ, but a vote is a vote.