Yeah, it was picked on purpose, but prematurely. They were hoping it would be representative of the issues they were trying to illuminate. When it turned out it wasn't, they made the huge tactical error of continuing to defend the criminal that got shot instead of saying "hey, the problem with racial bias does happen a lot, but that wasn't the case here".
On day one, there were enough issues with this case that were known that it should've been skipped. Like I said, I believe the the movement isn't interested in protecting or avenging the innocent. The movement never seems to pick an innocent victim.
No one would defend the cop in the case of the 12yo being gunned down in Cleveland. The video is clear and visceral. Other than losing the name of the boy with other victims, the movement had basically ignored it.
When I see something like this, my thought is "stupid or on purpose?"