They didn’t know they were buying post lock - that information wasn’t available until after the fact. Also - not every broker stopped trading BCIT on the “lock date” - IMO that’s another bullet for damages
Why would anyone buy post lock lol. You can hardly blame that on anyone.
Knowledge is power and they knew they were not backed by the DTC but they continued to sell all they could in collusion with/through UBS until they were stopped when the SEC halted trading.