BlackRock wants to take securities that are backed by mortgages and corporate mortgages that are effectively WORTHLESS, and put them into people's pensions as "investments". This gives BlackRock a revenue stream where if the underlying assets fail, people's pensions are wiped out. (AKA the people provide 'liquidity' for failing assets. People are being forced to bail out these big companies through their pensions.)
This happened back in 2008 and hasn't really stopped, and now that commercial real estate companies are going bankrupt (Evergrande comes to mind) it's starting to hurt banks and big companies like BlackRock, and they're trying to find a way to pass the buck to someone else while still making epic-fucktonnes of money.
