Yes, even a post asking why they're all disappearing, so quickly, disappeared
Which is relevant since the topic has been discussed quite a bit in HN with comments weighting in why he was guilty, which we now know he is not, case closed
Charitable explanation is that they are afraid that any discussion will inflame passions and can cause more rioting and further destruction and damage.
I don't think it will happen because this case sends a signal that protecting property from looters by all means including deadly force is acceptable. This removal of submissions is rather done out of shame that this judgment exposes the media which mispresented certain events around Blake's shooting and eventually caused the riots.